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router blocking SYN-ACKs from internal host
I have an internal host on my local network (actually, a raspberry pi) that I'm trying to send email from to an external host such as gmail.com. It's irrelevent, but it's a postfix server intended t...
ok, so I found the problem... so, for posterity: The problem wasn't in the router, it was a misconfiguration of my relayhost in postfix; I had a semicolon between user and password in the sasl password file that should have been a colon.
Now, it's properly directing traffic to whatever host I define.
<facepalm>
I wasn't able to connect to gmail-smtp-in.l.google.com over port 25 using two routers. Perhaps the SMTP settings on the the Google page below can help you. They might be requiring SSL/TLS for sending email.
Thanks for the reply... It's not just google, I get the exact same result trying to connect to 2 other servers, as well: gmail, zoho, and outlook all do exactly the same and I get a DoS warning in the router logs (which is why I thought of disabling the DoS protection option in the first place)... I used the traceroute output from Google to show examples of what I'm seeing.
However, I will indeed look at that link; it might help identify what I might be doing wrong across the board.
Thanks again!
ok, so I found the problem... so, for posterity: The problem wasn't in the router, it was a misconfiguration of my relayhost in postfix; I had a semicolon between user and password in the sasl password file that should have been a colon.
Now, it's properly directing traffic to whatever host I define.
<facepalm>