Many ISP's are now blocking traffic on port 25 (SMTP) not using their mail servers. You can do 1 of three things:
- Change your SMTP (outgoing mail) port to 26 (we have a second SMTP server running there).
- Enable secure authentication (SSL) for SMTP and use port 465.
- Contact your ISP and ask for their SMTP settings to send emails using their service.
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