Hi, we are evaluating the possibility to externalize the outgoing mail traffic, with a thirdy party provider. We'd like to evaluate a provider specific for hosting providers, like the above cited mailchannels. So that they have a specific ingress spam control and that control their own ips reputation. So this exclude the usual mail provider like mailgun, amazon ses, and like that. You known if exist some others provider like that in order to compare the services? Or you have real (in-production) use case? The mail outgoing traffic to evaluate is around 500K/month. ty
Delivery inbox to gmail/outlook/hotmail provider, in these days, is a real pain. Because also if you are perfectly configured and the score of your ips is almost perfect (>95) for some reason some domain name, got their mails always spammed on google for example. For no reason at all, and without any possibility to have any kind of feedback. So for that case, we'd like to evaluate to externalize the egress mail traffic.
I am hosting both company and private mail systems for the better part of over 10 years now and never did I encounter such behavior. If such big providers flag at lot of you mails as spam, it most likely is because you messed something up in configuring the mail systems or the mail content itself is questionable. Maybe you should analyze what is causing this rather then working your way around the problem.
If you like to, I can check what results I get when you try to send mail over to one of my systems. Maybe there is some trivial oversight on your end what's causing this issue. A open service to check at least some basic things is: https://www.mail-tester.com/
Never ever had issues like that unless dkim, spf and dmarc settings were absent or faulty. Both private and business mail.
Dear thank you for the feedback. Yeah sure I known very well that tool, like others of the same species. And if I have received less than 10/10 result on all of my trial, i had never ever opened that thread! Just to clarify: on your infrastructure, what is your mothly mail outgoing traffic? and from how many domains/mailbox?
Around 200.000 mails/day. I don't have a specific number of domains, but I would guess roughly in the region of 300-600 different domains in daily traffic. Although some of them really only might have like 1-2 messages/day.
200K sent by day, without problems of inbox delivery is very good. good for you. We haven't had any problem until we reached like 350-400K/month on around 2-3K domains and 15K mailboxes. Above that numbers some problems started. But happens (suddenlty) only on certain sender domains (says like 3-4 tickets/month, while others that send from the same infrastructure can reach inbox regularly). Is for that that is pretty much complex solve this specific delivery problems. What do you use to block egress spammy emails on your smarthost? We use pmg.
I use ISPConfig for the setup. So classic Postfix + rspamd + Dovecot, and some bigger exchange clusters behind all this. We have quiet some custom rules in rspamd but for the most part a pretty basic setup for outgoing mails. We do not see cases of outgoing spammy mails often - it happens when mailboxes get taken over through password leaks etc. but usually we detect such cases with monitoring quiet fast and intervene promptly. Another thing to note is that we usually advise our customer to not send newsletters over our mail systems, but rather use external services specialized for newsletters/massmails. Another point that might causes issues is the public IPv4/IPv6 addresses in use. We own our blocks for years now and have full control over them. Do your mails get flagged as spam in these edge cases, or do they straight up reject your mails? Do you have any rate limiting implemented for outgoing traffic?
I basically got the same here as pyte, with a bit lower numbers. We too urge our customers to use specialized services for mass mailings, like Sendgrid, Mandrillapp (Mailchimp) etc. I always score 10/10 when testing. Anything lower is usually an indication for me that I've misconfigured something.
