487 postsPage 38 of 49

Blog

A go-to resource on best practices for email security, anti-spam trends, product updates and everything in between.

Industry

Comparing Spamhaus with Proactive Connection Throttling

September 22, 20103 min read

We investigated the spam reduction efficacy of proactive throttling (aka traffic shaping) versus connection blocking using a reputable blacklist.

Read post

Corporate

MailChannels Blog is Back

September 3, 20101 min read

MailChannels Blog is Back

Read post

Industry

Amazon users blocked by the SORBS blocklist

July 6, 20102 min read

SORBS is listing Amazon EC2’s entire IP address space, causing major deliverability problems for Amazon EC2 customers.

Read post

Industry

The World’s Most Popular SMTP Error Responses

June 29, 20103 min read

We took a look at 9 million delivery attempts through one of our spam filters and compiled a list of the most common spam connection rejection messages.

Read post

Industry

Spam bot behavior suddenly changes

May 26, 20101 min read

Spammers appear to have changed their software so that it less often sends the QUIT command, as required by the RFC.

Read post

Industry

All about TLS-encrypted spam: Part III

May 19, 20103 min read

Techniques for solving the CPU load issues caused by encrypted spam are discussed.

Read post

Industry

Spammers on Amazon EC2 starting to hammer Asterisk (VoIP) servers

April 13, 20101 min read

There have been reports from the Asterisk open-source PBX community that spammers are attempting to gain access to Asterisk PBX through brute-force attacks.

Read post