this post was submitted on 16 Aug 2026
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They claim its for spam prevention which is why most ISPs actually also block outgoing SMTP port 25.
The dumb thing is, all it really does is push spammers onto using botted/stolen accounts which work way more effectively, and everyone else is forced to set up their email with Google or Microsoft.
If your domain isn't big enough to be recognized, all that SPF and DMARC won't mean crap to them.
European ISPs block egress port 25, not American ones, generally. Not sure about the rest of the world.
In Europe, one refuge is to send using the GSM networks, which tend not to block egress 25 for some reason.
Well then screw you AT&T lmao
AT&T is the worst of the worst. And I boycott them for countless reasons like snooping on their own customers voluntarily without a warrant. It’s really a hard-right corp. In any case, never tried them so I didn’t know they blocked egress 25.
One trick that works if truth-in-advertising laws are in force: ask the sales people before subscribing if the block port 25. They always say “no, we block nothing” (in my experience). So you subscribe and sign the contract. Then when you see they actually block 25, you have a false advertising situation and also a contract violation (if either verbal contracts are enforcable or if you can get it in writing that nothing is blocked). So you complain. In my experience, they give a gratis upgrade to an enterprise level of service that generally has a static IP and no blocks -- for the price of the residential plan you signed up for.