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cpanel mail error


How to fix error ‘421 Too many concurrent SMTP connections’ in cPanel and DirectAdmin servers

How to fix error ‘421 Too many concurrent SMTP connections’ in cPanel and DirectAdmin servers

Managing and troubleshooting mail servers forms a vital part of the Outsourced Website Support services we provide to shared server owners.

Among the common mail server errors, 421 is a common one that happens due to ‘too many concurrent SMTP connections’. This error usually denotes a high-traffic recipient mail server. (more…)

cPanel mail users frequently reporting “Increment Connection Ratelimit” errors? Here’s what you need to do

cPanel mail users frequently reporting “Increment Connection Ratelimit” errors? Here’s what you need to do

 

Increment Connection Ratelimit - ispip.net (local.home) [XX.XX.XX.XX]:61647 because of RBL match
JunkMail rejected - ispip.net (local.home) [XX.XX.XX.XX]:61647 is in an RBL, see http://www.spamhaus.org/query/bl?ip=XX.XX.XX.XX
SMTP connection from ispip.net (local.home) [XX.XX.XX.XX]:61647 I=[YY.YY.YY.YY]:465 closed by DROP in ACL

Do your customers report this error frequently? This happens when your customer’s ISP is blacklisted, leading to your customer’s mail being bounced. (more…)