Joe, a customer, states that since the new firewall has been installed, he has not been able
to send email. Which of the following ports on the firewall should be checked?
A.
21
B.
25
C.
110
D.
443
Explanation:
http://help.telecom.co.nz/app/answers/detail/a_id/1218/~/what-is-port-25-and-why-isitimportantfor-me%3F
Port 25 is the one that deals with sending email so does Port 143 (IMAP), but that is for the newer method of TCP/UPD.
Port 443: is HTTPs
Port 110: is PoP3 it receives email
Port 21: is FTP
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I’m sorry, but IMAP doesn’t send email, it only receives. Only SMTP is capable of sending and receiving.
POP3 also cannot send, only retrieve.
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0
B
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0
SMTP Port – How to Check if SMTP Port 25 is Blocked – SiteGround
Siteground › smtp_port_25_blocked
The standard port used for SMTP connections is 25. One of the most common reasons for not being able to send …
Why You Should Block Outgoing Port 25 (SMTP) On A Firewall « Scotia …
http://www.scotiasystems.com › it-hints-and-tips
Mar 19, 2010 – OK, having written the last post on how to block port 25 on an ASA firewall, I thought I’d write a follow …
Checking your outgoing mail server (Is Port 25 blocked?) – Media Temple
https://mediatemple.net › products › chec…
Introduction. Many email clients and services use port 25 for SMTP to send out emails.
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