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Thursday, April 4, 2019

What port does SMTP traffic use by default?

What port does SMTP traffic use by default?

25
21
443
80 
What port does SMTP traffic use by default?

EXPLANATION

SMTP (Simple Mail Transfer Protocol) traffic flows across TCP port 25. Some ISPs block end users from sending via this port in an effort to reduce spam and it seems to be working.
 
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