It's most likely to be a signature. Unless she is using a MAC in which case it could be a *.applefile which is something the mail box is unable to print at this time

Dear Mark:

I had my customer service person check the log files and you are correct, all of the emails sent got through okay. However, the attachment error message seems to be pointing to a "winmail.dat" file that is attached to those emails. This is most likely some kind of signature file that is embedded as an attachment instead of being placed as plain text within the body of the email. Even though the recipient on a standard email system would see this, the Presto service detects it as an error. So, what I would say is to tell Julie to either not place her signature file on emails to your Mother, or disregard the error notices because she now knows why they are there.

Of course, we will look at creating ways to avoid this type of confusion when improving our service over time.

I hope this helps,

Peter

Presto Insider: Peter Radsliff
CEO, Presto Services Inc.

Peter R. said: Dear Mark: I had my customer service person check the log files and you are correct, all of the emails sent got through okay.

It took two weeks and at least two Presto employees to get information to the customer that could and should have been available to him/her online in 5 minutes at the time of the incident.

See

http://www.prestoplace.com/forum/thread/10837/Suggestion/

and

http://www.prestoplace.com/forum/thread/10121/View-the-Queue/

Monique said: The exact same thing has been happening to me for the past few days. I tried sending an email with a PDF attachment and got that error message. Then I tried sending an email with copied and pasted text and received the same message. Finally i tried sending a plain email message with no attachment, no copied-pasted text and I got the same message. Would like to fix this problem since it defeats the purpose of having the Presto service!

Perhaps some more-useful and more-informative advice:  Your emails may have automatic attachments that you don't realize.  For example, the "Winmail.dat" file Peter was talking about is not a signature file but a text formatting file automatically attached by Microsoft Outlook.  If you are using Outlook you can fix this following http://email.about.com/od/outlooktips/qt/et121705.htm

If you are not using Outlook that attachment is not your problem but you still may have unnoticed attachments.  Signature files are little name/address/phone contact information files that an email program user can set up to have automatically sent with each email.  After setup the user may soon forget that they are automatically attached.  vCards (.vcf or .vcard files) are one example.  Look in your email program settings/options to turn these off.

That Presto does not know how to handle these common attachments is a serious bug but it is unlikely to be fixed any time soon ("over time", "in the future") so you will have to spend some frustrating time figuring it out yourself.