Email has no attachment

Question

I have randomly received emails in the past that I know have pdfs in them but mail on my powerbook pro says they have no attachments (no paperclip and no attachment). The emails have been coming from an Exchange server.
This morning I have stumbled across something that might have something to do with the "no attachment" issue.
If I check my email on either my iphone or ipad before my macbook pro and view the pdf on either device or both then go to my mac, it shows the email with no attachment.
Has anyone else had this problem?
If so can you redownload the individual email to get the attachment on the mac or is there a setting or rule that can fix this issue?
@Apple......if this is a bug then you should really look at addressing it as this has been an ongoing issue for a versions of mail now!!

Answer 1

I was one of the persons with the same problem but already solved it.
In my case the problem was related with the signature file but I'm not sure what the problem was.
I solved it this way:
1) create backup of signature file.
2) clear all content from the signature file.
3) restart thunderbird and see if the problem still exists. In my case it didn't.
4) add a content to the signature file tag by tag (in my case as it is html) and repeat #3.
This way I was able to put exactly the same content as before (!!) but no more attachment alerts.