Question

I’ve installed Postfix, opened port 25 (as well as ports 110, 995, 143, and 993) on my local computer connected to the Internet, but none of the e-mails that I am attempting to send out using the localhost:25 definition are being properly routed to their destination. Basically, I am trying to set up a local SMTP server to send out e-mails from my production website’s software (also hosted on the same local computer).

I am using Verizon FIOS Internet service, who reportedly blocks port 25 (but actually does not in my case, as I have enabled it and checked that is in fact accessible from my external IP address). I have attempted to send the e-mail using no Smart Host, then using Verizon’s SMTP server as a Smart Host, and finally using Verizon/Yahoo’s SMTP server as a Smart Host, but none of them have worked.

What could be causing this issue?

I really appreciate any help on this problem, because I’ve been working to no success on it for the past three hours. Thank you all in advance!

Answer 1

absolutely, it’s very common for large ISPs to block outbound connections on port 25 ~ they do this specifically to prevent what you are attempting. You should give them a call and verify if this is the case.

OR

See if you can configure your postfix to authenticate on your verizon mail account and relay your mail through that. [actually I did exactly this ~ I’ll see if I can dig up the config]

-sean

UPDATE

here we go:

relayhost = [smtp.gmail.com]:587
smtpd_sasl_auth_enable = no
smtp_sasl_security_options =
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

Sorry, I’m a little crunched on time, you’ll have to dig up the docs for postfix relaying and how to setup the password maps [cause I don’t recall offhand]

Hope his helps…