Get information about email spam and malware, including tips for blocking the latest threats like CEO scams, phishing, ransomware, viruses, trojans and more.

DNS problems affecting e-mail delivery: PTR records

Having outgoing e-mail rejected due to domain name system configuration issues is a common problem that Internet e-mail server administrators face. There are eight things you can check to make sure that your DNS is configured for optimum delivery. I will be covering a different item in each day of this series.

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Getting bounces about e-mail that you didn't send?

If you didn't send out a bulk e-mail campaign in the middle of the night but checked your inbox in the morning and found a lot of bounce messages with the subject lines like "failure notice", "Delivery Status Notification (Failure)", "Mail delivery failed: returning message to sender", "Undeliverable mail:", etc., you may have a virus.

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SMTP pipelining

Command pipelining is an extension to SMTP, the simple mail transport protocol, which speeds up the normal back and forth communication by sending multiple commands in a batch without waiting for a response to each one.

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Why is there spam?

"What is the purpose of spam?" This is often the first question asked in any discussion about unwanted e-mails. This article is going to briefly discuss what fuels the continuing onslaught of unsolicited commercial e-mail.

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