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Manaully Testing SMTP

You can manually test SMTP traffic by telnetting to a remote mail server.  Below are the steps:

Launch Telnet:

telnet mail.remotedomain.com 25

SMTP commands:

helo mydomain.com
main from: user@mydomain.com
rcpt to: user@remotedomain.com
data
subject: Test
Test Message
.
quit

You should get a 220 response connecting, a 250 response on all commands up to data, a 300-level response on the data command, and then a 250 response on closing the data section with a single period.

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