SOLVED 550 Error sending email from GMail to G Suite Business mail

Logan Sargent

Registered
Feb 21, 2017
2
1
1
United States
cPanel Access Level
Website Owner
I have a client I manage a website for and just moved him to a different host. He uses Gmail for Business. Within CPanel, I've setup the MX Entries to match Google instructions.

I have my email routing set to: Automatically Detect Configuration : Remote (recommended)

In the Authentication section I've added the following SPF record to my include list: _spf.google.com

I can get emailed delivered to his account when sending from an Office exchange acct through Outlook application, but when I send a test email from my personal Gmail acct, I get the following error:

550 Please turn on SMTP Authentication in your mail client. [removed] is not permitted to relay through this server without authentication.

Cannot for the life of me figure out how to resolve this.
 
Last edited by a moderator:

Jcats

Well-Known Member
PartnerNOC
May 25, 2011
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DataCenter Provider
Is your gmail account just a @gmail.com or are you trying send the emails from gmail through a different SMTP server? I am referring to if you went into Gmail > Settings > Accounts and Import > Send mail as:
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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Hello,

Check to ensure the SPF record matches exactly what Google recommends at:

Configure SPF records to work with G Suite - G Suite Administrator Help

Additionally, can you verify the domain name exists in the /etc/remotedomains file on the system, and if the "Enable Sender Rewriting Scheme (SRS) Support" option is enabled in "WHM >> Service Configuration >> Exim Configuration Manager >> Basic Editor"?

Thank you.
 

Logan Sargent

Registered
Feb 21, 2017
2
1
1
United States
cPanel Access Level
Website Owner
Ended up identifying a "Remote MX Wizard" within cPanel (must have overlooked that before) that appears to have resolved the issue. Looks like it changed a few other settings. Odd though that the MX entry records automatically generated by the wizard do not match precisely what Google reflects within the business mail acct, all is finally well.
 
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cPanelMichael

Administrator
Staff member
Apr 11, 2011
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Hello,

I'm happy to see the issue is now resolved. Thank you for updating us with the outcome.

Note that "Remote MX Wizard" is a third-party plugin.

Thank you.