I have plugin on my wordpress website which is basically a membership area. Once the user registers the user get put into a pending list. My client will then login to wordpress and activate the account. This process sends an email to the relevant user confirming registration is complete. I have tested this process via various email accounts and it works perfectly for me, however my client is getting lots of emails saying that they did not receive the activation email.
Is there anyway I can trace these emails to prove that they are sent? I understand the email may go into a junk folder, but I can not control that. All I want to do is prove to my client that the email has been sent. Is this possible?