Delivery Failure of Order Emails

Hi,
I wonder if someone can help or have faced the same issue as we are having lately.
we used too receive order emails to our gmail addresses (default store gmail address plus an extra defined in mail option)
Lately we have noticed that some order emails are coming to both gmail addresses and some orders only one email coming one gmail and some orders we are not receiving any. Also some times when we go into the order where we have not received any email, we done edit/save and seen that one of the gmail has received that order. We are very puzzled what is happening as we have not made any changes at the admin panel.
Most the order emails are ending in spam not because they are spam but with the following error
Undelivered Mail Returned to Sender
Mail Delivery System MAILER-DAEMON@soproxy7.mail.unifiedlayer.com
This is the mail system at host soproxy7.mail.unifiedlayer.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system
<our email@gmail.com>: host gmail-smtp-in.l.google.com[209.85.234.27]
said: 550-5.7.1 [74.220.222.102] Messages missing a valid messageId header
are not 550 5.7.1 accepted.
cx9-20020a056638490900b003416357d015si6435828jab.24 - gsmtp (in reply to
end of DATA command)


Our setting on mail ( Setting-> mail) is as follows:
Mail Engine: SMTP
Mail Parameters: -fnoreply@storename.com (*.com)
SMTP Hostname: ssl://mail.storename.com
SMTP Username: noreply@storename.com
SMTP Password: ...
SMTP Port: 465
SMTP Timeout

It will be highly appreciated if some one can help us to fix this issue as it was working fine previously

What is the OC version and theme you are using.
Are you using public email

@gmail.com or @yahoo.com etc

address and Own email server

@example.com

address at the same time to receive order confirmation email?

It's a known issue that OpenCart doesn't add the message-id header, which means if your mail server doesn't add it the email can be rejected.
viewtopic.php?t=224659

Majnoon wrote: ↑

Tue Jul 19, 2022 7:44 am

What is the OC version and theme you are using.
3.0.2, Getcart theme
Are you using public email

@gmail.com or @yahoo.com etc

address and Own email server
@gmail.com
bluehost is the hosting server

@example.com

address at the same time to receive order confirmation email?

my personal email as well as business email, both @gmail.com

ADD Creative wrote: ↑

Tue Jul 19, 2022 4:16 pm

It's a known issue that OpenCart doesn't add the message-id header, which means if your mail server doesn't add it the email can be rejected.
viewtopic.php?t=224659

we never had that issue until lately so are you saying that we need to contact hosting server. Would they know what header to add?

If none of the above seems to help, you could pay a developer such as ourselves or post a job in the Commercial Support Forum.

uzisports wrote: ↑

Tue Jul 19, 2022 4:57 pm

we never had that issue until lately so are you saying that we need to contact hosting server. Would they know what header to add?

Maybe Google changed their spam rules or your host changed there settings. Use an online email deliverability checker to see what is wrong with your emails.

ADD Creative wrote: ↑

Wed Jul 20, 2022 12:06 am

uzisports wrote: ↑

Tue Jul 19, 2022 4:57 pm

we never had that issue until lately so are you saying that we need to contact hosting server. Would they know what header to add?

Maybe Google changed their spam rules or your host changed there settings. Use an online email deliverability checker to see what is wrong with your emails.

plz recommend online email deliverability checker

https://www.mail-tester.com/ is probably the easiest to use.