TFWWebservices Posted January 8, 2017 Share Posted January 8, 2017 My customer uses gmail and they hasn't been getting billing reminders and I just found today that Gmail is blocking WHMCS billing emails due to an attachment This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: ********@gmail.com host gmail-smtp-in.l.google.com [64.233.189.27] SMTP error from remote mail server after end of data: 552-5.7.0 This message was blocked because its content presents a potential 552-5.7.0 security issue. Please visit 552-5.7.0 https://support.google.com/mail/?p=BlockedMessage to review our 552 5.7.0 message content and attachment content guidelines. w2si84994990pfg.122 - gsmtp Not sure how to resolve this issue. And it hasn't been a problem till just last month. But, I checked the page listed above and .PDF files aren't on the list. <update> I un-ticked the PDF attachment version of the invoice and now it seems to be going through. But, as I said before, PDF isn't on the banned attachment list. </update> 0 Quote Link to comment Share on other sites More sharing options...
pRieStaKos Posted January 9, 2017 Share Posted January 9, 2017 Got the same issue few days ago. I filled all the GMail forms and when they responeded, did a few changes on my mail server (more secure) and block was gone. Check you mail server and submit GMail forms on the links provided in the error. 0 Quote Link to comment Share on other sites More sharing options...
ykayiwa Posted July 8, 2021 Share Posted July 8, 2021 On 1/9/2017 at 4:55 AM, pRieStaKos said: Got the same issue few days ago. I filled all the GMail forms and when they responeded, did a few changes on my mail server (more secure) and block was gone. Check you mail server and submit GMail forms on the links provided in the error. Hello pRieStaKos, can you help share what you did to secure the sever. Am facing the same issue. The links provided in the error do not provide any form. 0 Quote Link to comment Share on other sites More sharing options...
pRieStaKos Posted July 9, 2021 Share Posted July 9, 2021 8 hours ago, ykayiwa said: Hello pRieStaKos, can you help share what you did to secure the sever. Am facing the same issue. The links provided in the error do not provide any form. https://support.google.com/mail/topic/7280460?hl=en&ref_topic=3394215 or send a support ticket to GMail. It's been 3 years.... 0 Quote Link to comment Share on other sites More sharing options...
Evolve Web Hosting Posted July 9, 2021 Share Posted July 9, 2021 I've seen this for a long time with Gmail and Yahoo. I'd suggest setting up Sendgrid, Mailgun or similar to get around this. Depending on your volume, you might fit on the free tier. 0 Quote Link to comment Share on other sites More sharing options...
xyzulu Posted July 10, 2021 Share Posted July 10, 2021 You need to setup DKIM and SPF correctly. 0 Quote Link to comment Share on other sites More sharing options...
ykayiwa Posted July 10, 2021 Share Posted July 10, 2021 8 hours ago, xyzulu said: You need to setup DKIM and SPF correctly. Thanks for this direction. It worked 1 Quote Link to comment Share on other sites More sharing options...
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