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Mail Client Issues

Ramize Attia
hello, Suddenly, all of mail clients cannot send through SMTP on my server. They are getting this error message: host smtp.mailgun.org SMTP error from remote mail server after RCPT to: emailaddress@domain.com 550 5.7.1 Relaying denied.
Sending from webmail will randomly get the error, but most of the times it will send without issues. I using mailgun to deliver emails, but message returning that error are not even delivered to mailgun an I have checked with them. When I reset all exim configuration to default cPanel settings, and still using mailgun it will work fine. But Outlook 2010 will show another error (Your server does not support the connection encryption type you have specified.) no matter if I use the domain or mail.domain or even the server hot. but on Outlook 2013 and other mail clients it will just work fine. I am using cPanel V 76.0.18

Comments

6 comments

Date Votes
  • Shood
    Hello @Ramize Attia While Outlook 2013 working fine may this a TLS 1.1 issue, these two articles on Microsoft describe this issue If the bellow cases true for you so that is really a TLS 1.x issue: Windows 7: Cannot send from Office 2007/2010 but can send from Office 2013, Windows 10 working fine for all office versions If so, you need to ask your clients whom using Win7 to enable TLS 1.2 [RECOMMENDED) or Enable TLS 1.0 on you server which is (Not Recommended) through Exim Configuration Manager
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  • Ramize Attia
    Hello @Ramize Attia While Outlook 2013 working fine may this a TLS 1.1 issue, these two articles on Microsoft describe this issue If the bellow cases true for you so that is really a TLS 1.x issue: Windows 7: Cannot send from Office 2007/2010 but can send from Office 2013, Windows 10 working fine for all office versions If so, you need to ask your clients whom using Win7 to enable TLS 1.2 [RECOMMENDED) or Enable TLS 1.0 on you server which is (Not Recommended) through Exim Configuration Manager

    First thank you. Second, doing so will result an error sending from any mailclient, including the android mail app. host smtp.mailgun.org SMTP error from remote mail server after RCPT to: emailaddress@domain.com 550 5.7.1 Relaying denied.
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  • Shood
    Hi @Ramize Attia I suggested this according to your say that the first error has been fixed: [QUOTE]I reset all exim configuration to default cPanel settings, and still using mailgun it will work fine..
    However, according to this error: [QUOTE]server does not support the connection encryption
    and [QUOTE]550 5.7.1 Relaying denied
    it's seems that you have both issues: TLS1.x and Hard Bounce with mailgun First see if this document on
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  • Ramize Attia
    Thanks again @Shood Well, here is where it gets tricky. If I reset all exim configurations back to cPanel defaults I will get the server does not support the connection encryption
    error. If I retain my normal exim configurations, I will get the 550 5.7.1 Relaying denied
    error. In both scenarios, I added the Mailgun in exim as a smarthost. and actually it used to work for a over two years, but all of this started to happen 4 days ago.
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  • Shood
    Hi @Ramize In fact I have no idea about Mailgun, I haven't experienced before so contacting their support maybe safe your time, but in general the 550 code indicates to a hard bounce email About the first error "connection encryption" I got it on my server when I updated cPanel to v68. Thus I can guide you in case you want to enable TLS 1.0 on you server which is Not the best choice as I mentioned before. Anyway, usually when I faced more than one problem at the same time on my server I try to completely resolve the first one then move to the second and so.., this makes you determine what's the major reason for each. Also, watching exim_mainlog events through exigrip command may gives you a helpful feedback that you can search for Regards
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  • cPanelLauren
    I would second the suggestion by @Shood to contact MailGun it sounds like their client is trying to connect with the outdated SSL protocol. You'd need to contact them to learn how to resolve this issue with their software.
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