Emails not being sent

When you say “they will not be sent”, what are you seeing in the POST SMTP logs?
Do you see a successful send in the POST SMTP logs, but the recipient is not receiving the emails?
Or are you seeing failures during the sending process in the POST SMTP logs?

If it’s during the sending process, post the error message and any diagnostic information here.

If you are not seeing any errors during the sending process, the problem is at the receiving end of the email chain and beyond the control of POST SMTP (or any other type of plugin).
If the problem is with receiving of the emails, have you configured your SPF, DMARC and DKIM within your zone file? Do the ReplyTo: From: match the sending domain you are using within your SMTP account? (Or have you added the relevant settings to your SPF records to allow that domain to send on behalf of?)

There is no entry in the POST SMTP logs of either success or failure.

I am using the google smtp.

Testing through the plugin has no problem. Apparently it can send emails to my account and others as well. But it does not do so consistently.

I don’t understand what you mean by zone file but if you are talking about the dns records then yes dmarc, dkim and spf are set up properly.

Yes reply to is the same domain as the account the smtp server is sending from.

Under the Logging tab, make sure logging is enabled.
That will log the full transcript between your site and the mail server.

If you run the diagnostics, post the info here. (taking out any personal info you don’t want displayed if there is any).

You want the transcript of a successful message? The failed messages are not being logged.

No, I want the transcript for a failed message. Switch the logging to ON.

If you are not seeing any failures (from the diagnostic output), then your problem is not with your website, POST SMTP or the mail provider you are using to send email. The problem is 100% with the receiving mail server. As you’ve said you have set up SPF, DMARC and DKIM correctly, you’ll need to verify your sending domains reputation (by using a domain reputation checking service).

You are trying to work out if you are successfully sending ALL messages or if the problem is at the receiving end.

Ok here is a sequence for you.

https://drive.google.com/file/d/0B78rvUqzAXivSE5YTW5yazhneC0zdzdsV0o4SXBNbmdURzQ4/view?usp=sharing

Screen capture of successful transaction. Customer might reasonably assume that the email has been sent. That email address is in my domain.

Here is a screen capture of your log after that transaction was done;

https://drive.google.com/file/d/0B78rvUqzAXivdURRSGI4SUZuRDlMczhZNmhLZ1QtZy1iRFpF/view?usp=sharing

You can see that it has no record of that email.

Now here is a screen capture of your test email to the same email address. Successfully completed to the same email address.

https://drive.google.com/file/d/0B78rvUqzAXivMUFESWQ2UVBzcGY4M3BoMXZHVjBPYkdfdlJz/view?usp=sharing

Brian

Didn’t notice this issue is stuck, still, need help?

I have gone back to the native mailer.

@brian1
Sorry about that, if you change your mind tag me here.