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There's a dedicated SMTP submission port. Try dialing e.g. gmail's MX record on 25. It might/should probably block.
by namibj 7y ago
There's a dedicated SMTP submission port. Try dialing e.g. gmail's MX record on 25. It might/should probably block.
- anticensor 7y agoIf you mean port 465, it is the port for SMTPS, not a dedicated submission port. I received timeout, not block, when I queried gmail on port 25. If it were blocked, I would get a TCP reset.
- vidarh 7y agoPort 587. Not nearly all consumer isps block port 25, but a lot do.