help with encrypted attachments

[jdc2000]

The additional details were helpful. From your first post I was thinking that your server was blocking all encrypted e-mails from the outside company. However, it now appears that you are using the certificates in client computers. Now I see why yout IT department thinks it is on their end. It looks like their certificates did not get installed correctly. Missing certificate details could well be the problem. The senders should try to get the the certificate they need to send to you fixed so it contains all necessary data. At this point, I don't know if they are using the same certificate to send to other users, or if they have indovodual certificaets for each sender and receiver pair.

[jerryctx]

This has been ongoing for about 3 weeks

Who did what to whom three weeks ago?

[TropicalBound]

I was wondering what happened three weeks ago myself. Did the cert expire?

Do you have an email firewall on your Exchange Server? If the firewall cannot scan the attachments, it will usually strip them off (depending on how it's configured). See if white listing their domain in the firewall helps.

Do you have another email address they could send the encrypted attachments to? Hotmail, Yahoo, etc?

TB

[MishNY]

Approx 3 weeks ago we had a PC in the company with a spam bot detected. Their server had us blacklisted for about 3 days. The problem was resolved and we were whitelisted.

We do have an email firewall on the exchange server and they are white listed. I am able to receive attachments from them as long as they are not encrypted. It's only when they encrypt it is stripped.

I am thinking perhaps that number that doesn't exist on their certificates is the "private key"?