Post by email posting same message multiple times
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I am using the Post by email feature for a Wordpress.org blog. I post by mail once a day and daily to the blog, usually around midnight. There are usually between 2 and 6 messages posting on any given day (sent as individual emails).
I have set up a secret POP email address to which I send emails, and these emails are picked up by Wordpress as Posts on my blog.
However, I am seeing the messages post multiple times; sometimes twice, sometimes up to 10 times in a row on the blog.
It usually happens for all messages on certain days, but some days this does not happen at all. I have not been able to identify a pattern of which days have this problem or if it is related to the number of messages posting on a particular day.
This issue began happening around October 2011; previously, I didn't notice this problem.
Thunderbird 7.1 email client; publish messages sent in text mode, with word wrap off
Google Apps account used as secret email. Account set to POP. All forwarding, etc. is turned off.
Steps: 1) wp-mail.php modified to post regardless of author, per bug 18923 which keeps messages stuck in Pending status 2) User from which posts sent is registered as Editor or Admin in Wordpress site. 3) Theme footer modified to include automatic checking for incoming messages 4) Email account is setup in mail client that matches the Admin/Editor email in Wordpress 5) Message to post is sent to the secret address by user
Result: 1) Wordpress on certain days posts the messages with no problem; other days, it posts multiple copies of the message. Usually, either all messages post multiple times or all post one time for a given day; I have not noticed that if one message on a particular day posts multiple times that another will post only once. 2) There can be anywhere from 2 to 10 copies of the same message posted. 3) I have tried to modify my POP account settings so that messages get Archived when read, rather than staying in the Inbox; however, this did not fix the problem.
Note: I use Google Apps as the email server for both the From: mail and the secret address mail.
I have not been able to find other discussions on this topic, nor track down any possible root cause of it.
Message of one of the posts that posted multiple times is attached.