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cPanel IP block – How to resolve and prevent IP blocks in cPanel/WHM servers
Web hosts can never shun server security! Majority of them have setup firewalls such as CSF/LFD to protect their cPanel servers by blocking IP addresses of attackers or malicious users. But we've seen many cases where these firewall settings are not proper, blocking...
Blocking spoofed mails going out from your cPanel/WHM server to protect it from blacklists
Outgoing spam is a major head ache for many web hosts. Spammers use compromised websites or mail accounts to send thousands of spam mail within a few mins. By the time the web host comes to know about it, the server IP would be blacklisted (eg. SpamHaus SBL), and...
How to fix error “454 4.7.1 Relay access denied” in Postfix mail servers
454 4.7.1 <user@domain.com>: Relay access denied This is a commonly seen email failure error by web hosts, website owners and server owners who run Postfix mail server. 454Â error usually happens while sending to and receiving from external domains. In our role...
Fix 554 5.7.1 Relay Access Denied – SMTP Error Solutions
554 5.7.1 : Relay access denied error is caused when sender authentication fails (corrupted DB, incorrect login, etc.) or recipient spam filter rejects mail.
Gmail blacklist removal for your mail servers
550-5.7.1 [203.**.**.**] Our system has detected an unusual rate of 550-5.7.1 unsolicited mail originating from your IP address. To protect our 550-5.7.1 users from spam, mail sent from your IP address has been blocked. Many often, you'd have had your customers...
How to prevent SpamHaus SBL (Spamhaus Block List) blacklisting in web hosting servers
554 5.7.1 Service unavailable; Client host [154.0.***.**] blocked using zen.spamhaus.org; https://www.spamhaus.org/sbl/query/SBL289647 SMTP error from remote mail server after pipelined DATA: 550-197.242.**.*** listed at zen.spamhaus.org You'd seen these error...
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