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Mail ports

Discussion in 'E-mail Discussions' started by EchoHost, Apr 3, 2007.

  1. EchoHost

    EchoHost Well-Known Member

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    For mail i have port 25 SMTP, 110 POP3 and 143 IMAP open. are all of them necessary?
     
  2. AndyReed

    AndyReed Well-Known Member
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    Port 25 is currently the default Port for SMTP. The major upcoming change to email is the use of TCP port 587 "submission" for email, as defined in section 3.1 of RFC 2476 - Message Submission. Port 587 is planned to replace the traditional use of TCP port 25, SMTP.

    Email clients such as MS Outlook/Express, Netscape, Eudora, and many others, connect to port 110, and Port 143 of a remote eMail server, then use the pop3 protocol to retrieve their eMail. In addition, email clients use imap protocol to retrieve their eMail, connect to port 143 of a remote eMail server.
     
  3. chirpy

    chirpy Well-Known Member

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    No, it is NOT. Read the first few lines of the RFC:
     
  4. AndyReed

    AndyReed Well-Known Member
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    :confused: Forum users should read the entire document, carefully.
     
  5. fikse

    fikse Well-Known Member

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    they are, might also want to open 465/993/995 for the secure versions...
     
  6. chirpy

    chirpy Well-Known Member

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    Indeed they should! It's a proposal for message submission, not for delivery or relaying which will continue to use port 25. Indeed, that RFC itself says that port 25 will still be used for email submission from MUA's. So, no, port 25 will continue to be used for both MTA to MTA and MUA to MTA traffic even if it is endorsed - so it won't be replacing port 25 at all. You may want to open up port 587, but there's no need to do so at present since port 25 is the accepted norm, which you will always need to keep open otherwise you won't get any email.
     
    #6 chirpy, Apr 4, 2007
    Last edited: Apr 4, 2007
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