I've seen this posted quite a bit in this site but I'm not finding the answers that I need specific to my problem. sorry!!
Anyway, it appears that when sending to just one domain, our .pdf attachments are stripped and replaced with winmail.dat file that is, as you know, unreadable. On one user we have attempted to send the e-mail as .html, and plaint .txt, and still it doesn't work. She used WordPerfect 12 to convert the document to .pdf, it didn't work. She scanned the document in through a scanner to her Outlook e-mail, renamed and saved the .pdf, sent it and it didn't work and she has scanned it from the printer, to her e-mail and sent it directly from there, and it didn't work.
We found that when we just go to our Sent e-mail and forward it to the intended recipient, it goes through and the attached .pdf is there.
Since this is a large client of ours, I am hesitant to point my finger at them. I need to be able to tell them exactly what the problem is or, preferably, find a way on our end to keep their system from stripping our attachment the first time around.
Hope this makes sense! Thank you!!