"Jon Koerber" HIDDEN@email@example.com> wrote:
After exhaustive debugging and testing, I have stumbled onto the problem. It appears, for whatever reason, that when sending email out from my development servers, PORT 25 fails?
If I change the email parameters to PORT 587, the email is sent almost instantly.
I have no idea why this is? On our production Application servers, they all send SMTP to the same email servers via PORT 25 (not 587) and they all work fine.
Does anyone know why this might be this way? Is it a firewall issue on the production email servers, application servers, or something else.
Or could it be that my local ISP is blocking outgoing PORT 25 traffic? I can't imagine that would be the case since I am able to send and receive emails via my normal Mac Mail client without an issue - unless Mac mail tries multiple SMTP ports when trying to send mail?
Any clarification on this would be greatly appreciated.
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