Bounced Email?

I have a customer (a graphic designer) who complains that when his customers try to send him attachments, it bounces back to them. I realize this could be a million different things, but I'm out of ideas and I'd really like to help this guy if possible. I'm using Cpanel and here's what I know:

The attachments were not huge and well within the quota he set for that email address.

He sent me two email addresses of the people who are having trouble sending attachments to him. One is hotmail, the other has a domain from a local business. Both of these people are local to my customer.

I sent him test emails with rather large attachments from several unrelated email accounts. Received with no trouble.

Since both are local and I can send him attachements, it leads me to believe it may relate to a local ISP. Does that seem likely? If so, any suggestions on how to make it jive with my service?

I tried several search terms in the forum and couldn't come up with anything relevant. Any insight is appreciated!
jc

 

 

 

 

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