In Emailx, the filename portion of attached files apparently cannot be longer than the traditional 8.3 format. If longer, it results in either a truncated attachment (at 4096 bytes in my case) or error 80 (bad attachment).

I want to attach a file named: batchar_exceptions.csv, but even trying to attach batcharexc.csv results in one of the above errors. However, the same file renamed to batarexc.csv gets emailed with no problems.

I have EMAILX.SBX v6.4(137) and A-Shell v6.4.1556.8 under Centos 6.10.

I think the workaround is to add a directory separator to the filename to make it clear to EMAILX that it is native format, e.g.

Obviously that should be fixed, but this might be a faster and otherwise painless workaround in the meantime.

The workaround didn't help. Then I discovered the real problem - I was trying to email un-closed files. This explains why the longer file was sent truncated while the smaller file didn't get sent.
EMAILX handles long filenames properly and no fix is needed. Thanks for your help.