Double email

[skeating]

Hello
Some of my accounts receive the same message twice, either at the same time or a few minutes apart. I have read the message: viewtopic.php?f=6&t=2154, and looked at my SMTP logs. I am using the SPAM scanner that comes with AMS, and it is behind a pfSense firewall. Could the delay from firewall to server be causing the doubling? Here is an example of one from a message I know was duplicated:

-> Success: Action=[Close Connection]
-> Success: Action=[Accept Connection], Details=[Port 25]
-> Success: Action=[Close Connection]
-> Success: Action=[Accept Connection], Details=[Port 25]
-> Success: Action=[Received Hello], Details=[Host=lenten.meetptx.us]
-> 204.188.246.46 -> Success: Action=[Received Sender], Details=[CNN-Report@lenten.meetptx.us]
-> Success: Action=[Received Recipient], Details=[email.net]

I have deleted the IPs and change the name of the recipient. Can you see anything from this that might suggest what the problem is?

Thanks
Stephen Keating

[Code Crafters]

Usually, the only cause for getting double emails are:

1. The user has aliases and matches on more than one recipient. Although in most of these cases you still shouldn't receive 2 emails.
2. Emails are being downloaded via POP3 Retrievals from an external account.
3. Content filtering is duplicating the email for that recipient.
4. 2 Emails were sent via SMTP, but this would show in the SMTP logs.

The delay from the firewall shouldn't cause the email to be received twice.

[skeating]

So if someone is downloading their email to either Outlook or a phone mail app, that could cause message doubling?

[Code Crafters]

You'd be best checking via WebMail or IMAP4 if there are duplicate emails.

Downloading to a phone shouldn't cause a duplicate unless the POP3 client is doing something wrong. Obviously, Outlook shouldn't have any issues with bugs like that.