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Linux SMTP relay – How we protect your mail servers from being open relays

Linux SMTP relay – How we protect your mail servers from being open relays

Protecting mail servers from being used as Linux SMTP open relays, is a major security task we perform as a part of our Dedicated Tech Support services for web hosting providers.

An open mail relay is an SMTP server that allows any host to send mails through it. If it is open relay, users can send mails through that Linux SMTP relay server without authenticating.
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How to resolve and prevent 554 5.7.1 : Relay access denied email errors in DirectAdmin web hosting servers

In DirectAdmin Linux shared hosting servers, Relay access denied error is a common email issue reported by web masters. Over time, Bobcares help desk support services devised procedures to resolve such issues in less than 10 minutes, and to an extend, prevent these issues from happening.

Relay access denied error means, the server is refusing a mail to another server from a domain owner’s email client. The mail server is unable to confirm whether the domain owner is authorized to send emails THROUGH it. Exim mail servers of DirectAdmin distinguish a valid sender when it gets a valid SMTP or POP/IMAP login from the domain user. (more…)

How to resolve and prevent 554 5.7.1 : Relay access denied email errors in cPanel/WHM web hosting servers

In a shared web hosting environment like cPanel/WHM, Relay access denied email error is a common email issue reported by web masters. Over time, Bobcares help desk support services devised ways to resolve such issues in less than 10 minutes, and to an extend prevent these issues from happening.

Relay access denied error means, the server is refusing a mail to another server from a domain owner’s email client. The mail server is unable to confirm whether the domain owner is authorized to send emails THROUGH it. cPanel Exim email servers distinguish a valid sender when it gets a valid SMTP or POP/IMAP login from the domain user. (more…)