Sender address rejected: User unknown in virtual mailbox table

Discussion in 'Installation/Configuration' started by omegades, Apr 8, 2021.

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  1. omegades

    omegades New Member

    Good evening,
    I am unable to email from within the domain. I use mailgun as an external provider. When I email from one user ([email protected]) to another user ([email protected]) within the same domain, I get 'User unknown in virtual mailbox table'.

    From external email addresses outside of my domain, ie from my gmail, after removing $myhostname from mydestination, at least these arrive.

    This is a clean install with the ISPconfig autoinstaller on Ubuntu 20.04.

    Code:
    ##### SERVER #####
IP-address (as per hostname): ***.***.***.***
[WARN] could not determine server's ip address by ifconfig
[INFO] OS version is Ubuntu 20.04.2 LTS

[INFO] uptime:  23:25:09 up  3:32,  2 users,  load average: 0.01, 0.02, 0.00

[INFO] memory:
              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       664Mi       678Mi        74Mi       645Mi       1.1Gi
Swap:            0B          0B          0B

[INFO] systemd failed services status:
  UNIT                  LOAD   ACTIVE SUB    DESCRIPTION
● clamav-daemon.service loaded failed failed Clam AntiVirus userspace daemon

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

1 loaded units listed.

[INFO] ISPConfig is installed.

##### ISPCONFIG #####
ISPConfig version is 3.2.4


##### VERSION CHECK #####

[INFO] php (cli) version is 7.4.16

##### PORT CHECK #####


##### MAIL SERVER CHECK #####


##### RUNNING SERVER PROCESSES #####

[INFO] I found the following web server(s):
        Apache 2 (PID 348838)
[INFO] I found the following mail server(s):
        Postfix (PID 356738)
[INFO] I found the following pop3 server(s):
        Dovecot (PID 348785)
[INFO] I found the following imap server(s):
        Dovecot (PID 348785)
[INFO] I found the following ftp server(s):
        PureFTP (PID 349033)

##### LISTENING PORTS #####
(only           ()
Local           (Address)
[anywhere]:993          (348785/dovecot)
[anywhere]:995          (348785/dovecot)
[localhost]:11332               (348775/rspamd:)
[localhost]:11333               (348775/rspamd:)
[localhost]:11334               (348775/rspamd:)
[localhost]:10023               (33035/postgrey)
[anywhere]:587          (356738/master)
[localhost]:11211               (70759/memcached)
[localhost]:6379                (32746/redis-server)
[anywhere]:110          (348785/dovecot)
[anywhere]:143          (348785/dovecot)
[anywhere]:465          (356738/master)
***.***.***.***:53              (349040/named)
***.***.***.***:53              (349040/named)
***.***.***.***:53              (349040/named)
[localhost]:53          (349040/named)
[anywhere]:21           (349033/pure-ftpd)
***.***.***.***:53              (510/systemd-resolve)
[anywhere]:22           (658/sshd:)
[anywhere]:25           (356738/master)
[localhost]:953         (349040/named)
[anywhere]:4190         (348785/dovecot)
*:*:*:*::*:993          (348785/dovecot)
*:*:*:*::*:995          (348785/dovecot)
*:*:*:*::*:3306         (348103/mysqld)
*:*:*:*::*:587          (356738/master)
*:*:*:*::*:6379         (32746/redis-server)
[localhost]10           (348785/dovecot)
[localhost]43           (348785/dovecot)
*:*:*:*::*:8080         (348838/apache2)
*:*:*:*::*:80           (348838/apache2)
*:*:*:*::*:465          (356738/master)
*:*:*:*::*:8081         (348838/apache2)
*:*:*:*::*2837:acff:fe8f:53             (349040/named)
*:*:*:*::*e4a7:ff:fe71:5:53             (349040/named)
*:*:*:*::*:53           (349040/named)
*:*:*:*::*:21           (349033/pure-ftpd)
*:*:*:*::*:22           (658/sshd:)
*:*:*:*::*:25           (356738/master)
*:*:*:*::*:953          (349040/named)
*:*:*:*::*:443          (348838/apache2)
*:*:*:*::*:4190         (348785/dovecot)




##### IPTABLES #####
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
f2b-postfix-sasl  tcp  --  [anywhere]/0            [anywhere]/0            multiport dports 25
f2b-sshd   tcp  --  [anywhere]/0            [anywhere]/0            multiport dports 22

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain f2b-postfix-sasl (1 references)
target     prot opt source               destination
RETURN     all  --  [anywhere]/0            [anywhere]/0

Chain f2b-sshd (1 references)
target     prot opt source               destination
REJECT     all  --  ***.***.***.***         [anywhere]/0            reject-with icmp-port-unreachable
REJECT     all  --  ***.***.***.***         [anywhere]/0            reject-with icmp-port-unreachable
REJECT     all  --  ***.***.***.***        [anywhere]/0            reject-with icmp-port-unreachable
REJECT     all  --  ***.***.***.***         [anywhere]/0            reject-with icmp-port-unreachable
REJECT     all  --  ***.***.***.***       [anywhere]/0            reject-with icmp-port-unreachable
RETURN     all  --  [anywhere]/0            [anywhere]/0
    main.cf file
    Code:
    # See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = /usr/share/doc/postfix

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2



# TLS parameters
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_tls_security_level = may

smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level = dane
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
myhostname = isp.remedium.sg
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
myorigin = /etc/mailname
mydestination = localhost.$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
html_directory = /usr/share/doc/postfix/html
virtual_alias_domains = proxy:mysql:/etc/postfix/mysql-virtual_alias_domains.cf
virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_alias_maps.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /var/vmail
virtual_uid_maps = proxy:mysql:/etc/postfix/mysql-virtual_uids.cf
virtual_gid_maps = proxy:mysql:/etc/postfix/mysql-virtual_gids.cf
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_restriction_classes = greylisting
greylisting = check_policy_service inet:127.0.0.1:10023
smtpd_recipient_restrictions = permit_mynetworks, reject_unknown_recipient_domain, reject_unlisted_recipient, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unauth_destination, check_recipient_access proxy:mysql:/etc/postfix/mysql-virtual_recipient.cf, check_recipient_access mysql:/etc/postfix/mysql-virtual_policy_greylist.cf, check_policy_service unix:private/quota-status
smtpd_use_tls = yes
transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
relay_domains = proxy:mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = proxy:mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $smtpd_sender_login_maps $virtual_uid_maps $virtual_gid_maps $smtpd_client_restrictions $smtpd_sender_restrictions $smtpd_recipient_restrictions $smtp_sasl_password_maps $sender_dependent_relayhost_maps
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, check_helo_access regexp:/etc/postfix/helo_access, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, check_helo_access regexp:/etc/postfix/blacklist_helo, ,reject_unknown_helo_hostname, permit
smtpd_sender_restrictions = check_sender_access proxy:mysql:/etc/postfix/mysql-virtual_sender.cf, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_sender, reject_unlisted_sender
smtpd_reject_unlisted_sender = no
smtpd_client_restrictions = check_client_access proxy:mysql:/etc/postfix/mysql-virtual_client.cf, permit_inet_interfaces, permit_mynetworks, permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org, reject_unauth_pipelining , permit
smtpd_etrn_restrictions = permit_mynetworks, reject
smtpd_data_restrictions = permit_mynetworks, reject_unauth_pipelining, reject_multi_recipient_bounce, permit
smtpd_client_message_rate_limit = 100
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
virtual_transport = lmtp:unix:private/dovecot-lmtp
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = regexp:/etc/postfix/mime_header_checks
nested_header_checks = regexp:/etc/postfix/nested_header_checks
body_checks = regexp:/etc/postfix/body_checks
owner_request_special = no
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2,!SSLv3
smtp_tls_protocols = !SSLv2,!SSLv3
smtpd_tls_exclude_ciphers = RC4, aNULL
smtp_tls_exclude_ciphers = RC4, aNULL
smtpd_tls_mandatory_ciphers = medium
tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA
tls_preempt_cipherlist = yes
address_verify_negative_refresh_time = 60s
enable_original_recipient = no
sender_dependent_relayhost_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayhost.cf
smtp_sasl_password_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayauth.cf, texthash:/etc/postfix/sasl_passwd
smtp_sender_dependent_authentication = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous, noplaintext
smtp_sasl_tls_security_options = noanonymous
smtpd_forbidden_commands = CONNECT,GET,POST,USER,PASS
address_verify_sender_ttl = 15686s
smtp_dns_support_level = dnssec
dovecot_destination_recipient_limit = 1
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_milters = inet:localhost:11332
non_smtpd_milters = inet:localhost:11332
milter_protocol = 6
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_default_action = accept
    I tested incoming mail from Roundcube, and local mail delivery seems to be working fine. My FQDN/hostname: isp.remedium.sg.

    Mail.log below (as you can see the first two arrive, the third from mailgun in the same domain it's rejected)
    Code:
    Apr  7 23:36:49 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358794, secured, session=<3b6mZ2q/3qp/AAAB>
Apr  7 23:36:50 isp dovecot: imap([email protected])<358794><3b6mZ2q/3qp/AAAB>: Logged out in=90 out=967 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:36:53 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358796, secured, session=<5XfWZ2q/4Kp/AAAB>
Apr  7 23:36:53 isp dovecot: imap([email protected])<358796><5XfWZ2q/4Kp/AAAB>: Logged out in=458 out=1913 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=292 body_count=1 body_bytes=6
Apr  7 23:36:55 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358798, secured, session=<1Vr+Z2q/4qp/AAAB>
Apr  7 23:36:55 isp dovecot: imap([email protected])<358798><1Vr+Z2q/4qp/AAAB>: Logged out in=32 out=520 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:36:55 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358800, secured, session=<X/7+Z2q/5Kp/AAAB>
Apr  7 23:36:55 isp dovecot: imap([email protected])<358800><X/7+Z2q/5Kp/AAAB>: Logged out in=44 out=627 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:37:06 isp postfix/smtpd[358815]: connect from localhost[127.0.0.1]
Apr  7 23:37:06 isp postfix/smtpd[358815]: DEAB313F1A7: client=localhost[127.0.0.1], sasl_method=LOGIN, [email protected]
Apr  7 23:37:06 isp postfix/cleanup[358818]: DEAB313F1A7: message-id=<[email protected]>
Apr  7 23:37:06 isp postfix/qmgr[356741]: DEAB313F1A7: from=<[email protected]>, size=636, nrcpt=1 (queue active)
Apr  7 23:37:06 isp postfix/smtpd[358815]: disconnect from localhost[127.0.0.1] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Apr  7 23:37:06 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358822, secured, session=<HNCpaGq/FKt/AAAB>
Apr  7 23:37:06 isp dovecot: lmtp(358821): Connect from local
Apr  7 23:37:06 isp dovecot: imap([email protected])<358822><HNCpaGq/FKt/AAAB>: Logged out in=465 out=701 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:37:06 isp dovecot: lmtp([email protected])<358821><kOJEOiJCbmCleQUAe/Z/7g>: sieve: msgid=<[email protected]>: stored mail into mailbox 'INBOX'
Apr  7 23:37:07 isp postfix/lmtp[358819]: DEAB313F1A7: to=<[email protected]>, relay=isp.remedium.sg[private/dovecot-lmtp], delay=0.1, delays=0.02/0.03/0.02/0.02, dsn=2.0.0, status=sent (250 2.0.0 <[email protected]> kOJEOiJCbmCleQUAe/Z/7g Saved)
Apr  7 23:37:07 isp postfix/qmgr[356741]: DEAB313F1A7: removed
Apr  7 23:37:07 isp dovecot: lmtp(358821): Disconnect from local: Client has quit the connection (state=READY)
Apr  7 23:37:07 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358824, secured, session=<QyuzaGq/GKt/AAAB>
Apr  7 23:37:07 isp dovecot: imap([email protected])<358824><QyuzaGq/GKt/AAAB>: Logged out in=70 out=668 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:37:07 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358827, secured, session=<Mbu3aGq/Gqt/AAAB>
Apr  7 23:37:07 isp dovecot: imap([email protected])<358827><Mbu3aGq/Gqt/AAAB>: Logged out in=318 out=2863 deleted=0 expunged=0 trashed=0 hdr_count=4 hdr_bytes=879 body_count=0 body_bytes=0
Apr  7 23:37:07 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358828, secured, session=</RG4aGq/HKt/AAAB>
Apr  7 23:37:07 isp dovecot: imap([email protected])<358828></RG4aGq/HKt/AAAB>: Logged out in=120 out=801 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr  7 23:37:59 isp postfix/smtpd[358815]: connect from mail-ot1-f44.google.com[209.85.210.44]
Apr  7 23:37:59 isp postfix/smtpd[358815]: C09F113F1A7: client=mail-ot1-f44.google.com[209.85.210.44]
Apr  7 23:37:59 isp postfix/cleanup[358818]: C09F113F1A7: message-id=<CAPSmwEdxfz6As_0Pd4ig35ik5VBNgq=Dc9rrpPuD23fc-2UO+g@mail.gmail.com>
Apr  7 23:38:00 isp postfix/qmgr[356741]: C09F113F1A7: from=<[email protected]>, size=2733, nrcpt=1 (queue active)
Apr  7 23:38:00 isp dovecot: lmtp(358821): Connect from local
Apr  7 23:38:00 isp dovecot: lmtp([email protected])<358821><aJFyEVhCbmCleQUAe/Z/7g>: sieve: msgid=<CAPSmwEdxfz6As_0Pd4ig35ik5VBNgq=Dc9rrpPuD23fc-2UO+g@mail.gmail.com>: stored mail into mailbox 'INBOX'
Apr  7 23:38:00 isp postfix/lmtp[358819]: C09F113F1A7: to=<[email protected]>, relay=isp.remedium.sg[private/dovecot-lmtp], delay=0.57, delays=0.55/0/0/0.01, dsn=2.0.0, status=sent (250 2.0.0 <[email protected]> aJFyEVhCbmCleQUAe/Z/7g Saved)
Apr  7 23:38:00 isp postfix/qmgr[356741]: C09F113F1A7: removed
Apr  7 23:38:00 isp dovecot: lmtp(358821): Disconnect from local: Client has quit the connection (state=READY)
Apr  7 23:38:00 isp postfix/smtpd[358815]: disconnect from mail-ot1-f44.google.com[209.85.210.44] ehlo=2 starttls=1 mail=1 rcpt=1 bdat=1 quit=1 commands=7
Apr  7 23:38:07 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=358848, secured, session=<2PVLbGq/Qqt/AAAB>
Apr  7 23:38:07 isp dovecot: imap([email protected])<358848><2PVLbGq/Qqt/AAAB>: Logged out in=318 out=3343 deleted=0 expunged=0 trashed=0 hdr_count=5 hdr_bytes=1145 body_count=0 body_bytes=0
Apr  7 23:38:24 isp postfix/smtpd[358815]: connect from rs241.mailgun.us[209.61.151.241]
Apr  7 23:38:25 isp postfix/smtpd[358815]: NOQUEUE: reject: RCPT from rs241.mailgun.us[209.61.151.241]: 550 5.1.0 <[email protected]>: Sender address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<rs241.mailgun.us>
Apr  7 23:38:25 isp postfix/smtpd[358815]: disconnect from rs241.mailgun.us[209.61.151.241] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6
Apr  7 23:39:07 isp dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=359204, secured, session=<S3rfb2q/Xqt/AAAB>
Apr  7 23:39:07 isp dovecot: imap([email protected])<359204><S3rfb2q/Xqt/AAAB>: Logged out in=136 out=1169 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
    Any help would be GREATLY appreciated...! :) I thank you so much. Please let me know if you require any other information.
     
    omegades, Apr 8, 2021
    #1
  2. Jesse Norell

    Jesse Norell Well-Known Member Staff Member Howtoforge Staff

    So mailgun is sending to you claiming the message is from an address in your domain which doesn't exist, and appears may even be randomly generated? That just seems like a wrong setup; eg. any mail they send which bounces will have the bounces going to your server and they will get rejected? Or mailgun is actually the mx host for your domain? If the latter, and you otherwise don't receive mail to your domain directly from the internet, they adding your domain to the postfix whitelist, type sender.
     
    Jesse Norell, Apr 8, 2021
    #2
  3. omegades

    omegades New Member

    Morning Jesse! Appreciate the reply!

    It seems that adding remedium.sg to the whitelist type sender has solved the problem...! Thanks!!

    Mailgun is not the MX, see the attachment.

    Any explanation why? I have been busy with this for literally hours.

    This issue came when upgrading from 3.1 to 3.2.

    Thanks again, much much appreciated!
     

    Attached Files:

    omegades, Apr 8, 2021
    #3
  4. Jesse Norell

    Jesse Norell Well-Known Member Staff Member Howtoforge Staff

    Various mail restrictions were added in 3.2 versions, which explains the change; it is still not clear why you would have an external mail delivery service send mail for you using generated bounce addresses for which they cannot receive the bounces, nor does it seem like a good idea that they would use addresses on your main domain to send from, which eg. will preclude you from ever setting up a restrictive dmarc policy (or you must allow mailgun to dkim sign for all addresses in your domain, which isn't ideal); it seems like them using a subdomain or different domain entirely would be the way to go. But, glad your current issue is solved.
     
    Jesse Norell, Apr 8, 2021
    #4

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