Home / Tag Archives: mail server (page 2)

Tag Archives: mail server

February, 2010

  • 26 February

    Limit the incoming email rate in Postfix

    Question: I have spammers sending multiple email messages to my mail server. How can can I limit the number of emails they can send in a given amount of time? Answer: This is a trick that many spammers and malicious hackers will use to flood your server with their nonsense. …

January, 2010

  • 6 January

    Testing your mail server for an open relay

    Question: How do I make sure my mail server isn’t an open relay? Answer: First we should be clear on what an open relay is. According to spamhelp.org, an open relay is: “a mail server that does not verify that it is authorised to send mail from the email address …

  • 6 January

    What is DNSBL and should I care about it?

    Question: What is DNSBL and should I care about it? Answer: DNSBL stands for DNS Block List or Blacklist. Essentially, it is a published list of ipp addresses that are in some way connected to spam. Although the most common form of DNSBL is a list of actually servers and/or …

December, 2009

  • 30 December

    How to setup an SSL Dovecot mail server

    Question: How do I setup Dovecot to use IMAPS and POP3S with Postfix certificates? Answer: Dovecot is a free and open source IMAP and POP3 mail server. It is used for receiving incoming mail and works in conjunction with Postfix, which handles sending and delivery. Dovecot runs on all Linux …

  • 17 December

    Watching Linux logs live

    Question: How can I watch information come into my Linux server logs as they arrive? Answer: Linux has a nifty little command called “tail” that allows you to see the latest log file messages, but that by itself will not show you the latest messages as they arrive in real …

June, 2009

  • 19 June

    POP3, IMAP, and Webmail

    When signing up for web hosting, a new user will encounter a lot of new jargon. Among those many new terms are: POP3, IMAP, and Webmail. All three are related to how a mail server delivers and presents email. Although webmail is becoming one of the more popular choices, with …