Vps with port 25 blocked, is there a solution?

Hello to all the readers and collaborators of this wonderful project.
I'm having problems sending email, my isp blocks port 25 and it does not open, I already tried everything with isp, it did not work.
My e-mail queue returns as: 25: Connection time exceeded or: 25: Network unreachable.

Or is there some good reputation isp that indicate with port 25 open for use

 

Recent discussion:
https://www.howtoforge.com/communit...ng-email-but-not-receiving.72076/#post-381232

 

The provider I hired blocks the output 25, the input 25 is open. As a reference point, I get regular emails. only the output returns the timeout. Between domains in the vps itself sends and receives normal.
Is there any chance a rule in iptables fix this problem?

in south america, all providers block port 25, digitalocean also does not open for new customers, other than those mentioned in the post: Linode, Hetzner or digitalocean.
Do you indicate another provider? As I do not know the suppliers of europa, I met a company, Contabo with attractive products

 

Perfect server tutorial already covers the part for sending mails via port 587 by enabling submission inet n - n - - smtpd in postfix master.cf, so if you followed the tutorial and your mail server still does not work, port 25 is probably blocked on both sides i.e. in and out.

 

ahrasis, Thanks!
the master.cf file is configured as a tutorial, and it still does not work.
you're right, was using web tools to check port 25, always returns open.
But trying to connect via telnet does not connect.
To redirect from ports or rules in iptables, does this not solve the problem?

 

We don't know but if you cannot utilized port 25 for mail server, you are out of luck. So either try other vps wholly or find vps for mail server only.

 

Ok, I get it .. Mail server with port 25 closed does not work. about mailgun and other similar services, is it a good option? What do you think? What is your opinion?

 

I am using GSuite as a relay and am not sure to recommend any other services. But depending on your mail needs, I think building a mail server on other vps will be the best way for you.

 

fantastic, I did not imagine that I could use gsuite as a relay, always by mx. I am happy with this information and will try to find out more. Here in howtoforge not the tutorial in this title?

and all the readers, I'm sorry for the google translate english.

 

I don't think there is any tutorial for GSuite but feel free to search or ask. There are two places in ISPConfig settings, one at System > Server Config > Mail and the other at System > Main Config > Mail.

 

I am sad, gsuite accounts accepted for retransmission, can not be free accounts.
but this tip of the ispconfig panel to configure the relay, port and encryption was great..
Ahrasis, thanks

 

Yes it is no more free except for education and non profitable organizations.

 

my God.
I was excited about the settings on the panel and I modified the port to 587 and activated STARTTLS to test and verify the result on master and main.
But now roundcube does not log in, says login failed.
Can you help me?

 

it is necessary to change port 25 to 587 in the file /etc/roundcube/config.inc.php, I noticed that the change in the port causes login error and smtp 220.
because?

 

Sorry but I don't use roundcube for quite sometimes, so I don't remembers what affect its settings that much.

 

I think building a mail server on other vps will be the best way for you.