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using seperate mail server to send website emails, cannot send email to mailboxes on the same domain



I've configured a new WordPress website to send emails from no-reply@domain.com for things like user registrations, password resets and newsletters.




The email info@domain.com is the only other mailbox for this domain which is what the site's owner will use for enquiries and personal outgoing mail.



info@domain.com uses Namecheap's private email hosting, while no-reply@domain.com uses my own iRedMail mail server. I am able to receive emails at info@domain.com and send from no-reply@domain.com without issues, however if I try send an email from no-reply@domain.com to info@domain.com, I receive the following error:




5.1.1 : Recipient address rejected: User unknown in virtual mailbox table. Please check the message recipient info@domain.com and try again.




What can I do about this? I have tried creating a info@domain.com user on the iRedMail server, however emails sent from no-reply@domain.com go to the inbox on the iRedMail server rather than the intended Namecheap inbox.




This is an issue primarily because the contact form on the site will send enquiries to info@domain.com.


Answer



The error message that you are receiving is coming from your internal iRedMail mail server and is not a response from the Namecheap SMTP server. Since you configured iRedMail with the Domain "domain.com" it does not even attempt to send mail outside of its own mail server for the email domain that it believes it is hosting.



Configure the Wordpress server to send email through Namecheap's SMTP server rather than the localhost iRedMail server.


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