this post was submitted on 17 Jul 2025
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I was trying to set up mail for my server, to send status emails, gitlab emails, etc. I know this can be done with relays but I was interested in sending mail directly using SMTP. Apparently my ATT residential internet blocks outbound signals on that port by default, although there are several reports of people calling customer support and getting that changed.

The most recent thing I can find was someone on Reddit 3 years ago:

xnojack: Probably depends on the rep. Just got mine unblocked a week ago. I read online though its better to say you're looking to allow SMTP outbound rather than port 25 outbound. Cause on the reps end its called something like SMTP outbound filter. (link)

I tried to call in and get this changed, the rep was very helpful but either something's changed on their end or he was looking in the wrong place. Anyways, I was wondering if any of you have gone through this process recently and know if this is still a thing, or have any advice.

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[–] alexgreen@techhub.social 1 points 22 hours ago

@AdrianTheFrog blocking 25 port is a standard policy.
Buy static IP (subnet actually) or ask support to remove all firewall rules (I had to speak with many of the support personnel until found someone who knows how to do).

Ended up with using a separate VPS for mail server as my att ip was in blacklisted)

[–] SheeEttin@lemmy.zip 16 points 4 days ago (1 children)

Yeah, residential ISPs do that because if they don't, spammers will just turn every botnet member into a spam host. You'll probably have to get a business connection or change ISPs.

Or just don't self-host email. I wouldn't recommend it unless you're a masochist.

[–] quokka1@mastodon.au 2 points 4 days ago

@SheeEttin @AdrianTheFrog +1 Email for me is basically irrelevant. MFA resets, adverts from companies I forgot to unsubscribe from and a couple of bills. No personal correspondence or anything I would think is worth self-hosting it for these days. Other than many headaches.

[–] Brkdncr@lemmy.world 1 points 2 days ago

Port reflector or smtp relay. But the cost approaches the cost of hosted mails service.

If i had to do this myself i would look at a vps or a business-class ISP.

[–] sludgewife@lemmy.blahaj.zone 5 points 3 days ago (1 children)

even if you get port 25 unblocked your IP won't pass the sniff test. you must have a PTR record on the IP pointing to your domain for the large email hosts to accept mail from you. i use amazon SES to handle outbound because of this hurdle. it sucks

[–] AdrianTheFrog@lemmy.world 1 points 3 days ago (2 children)
[–] sludgewife@lemmy.blahaj.zone 1 points 3 days ago (1 children)

for my own sanity i will assume the audience of that page you linked is business customers given one of their examples is a .gov. im just residential. getting a static ip out here felt monumental in itself

[–] AdrianTheFrog@lemmy.world 1 points 3 days ago

It had an email for uverse at the bottom which I am pretty sure is residential? Idk

[–] sludgewife@lemmy.blahaj.zone 1 points 3 days ago

it was apparently impossible for my isp. i have a very good deal on a static ip so reluctant to rock the boat

[–] hperrin@lemmy.ca 3 points 4 days ago

I did this about four years ago. You have to be really specific, because to them, it doesn’t look blocked (it’s not a total block, just outbound traffic, which I guess is a different system). Took a few hours on the phone with them, but we got it working.

[–] cmeu@lemmy.world 1 points 4 days ago (1 children)
[–] 3dcadmin@lemmy.relayeasy.com 1 points 3 days ago (1 children)

I run an SMTP relay.... very few takers, most just pay for managed email hosting. I run an smtp relay so multiple wordpress sites and services I self host can send mail. My lemmy instance is one

[–] cmeu@lemmy.world 1 points 2 days ago

Some of us are just built different, I guess Thanks for doing the Lord's work