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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. …
February, 2010
January, 2010
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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 …
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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
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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 …
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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
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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 …