I do not believe there is a file limitation. However, it could be that your message line is too long (256 characters) or it could be caused by your e-mail system limiting the size of e-mails going out. I would suggest that you try to e-mail the file directly from your e-mail program and see if it is stopped. If it is not, then check the length of the message that you are sending.
Additional comments from Search400.com member Eldon Dobring:
“We ran into a very simular problem. Our e-mail files sent via SNDDST were being truncated. IBM had us issue a command called CHGPOPA and change the Message split size to *NOMAX. This resolved our problem.”
Turning e-mail message splitting off may cause problems when sending
large e-mail to mail clients that cannot handle large messages.
SMTP is not a file-transfer protocol; it is designed and architected to send e-mail, not files.
If you need to send files, use FTP or other protocol that is intended to handle files.
E-mail servers are often enough clogged and overburdened by spam. Sending files in e-mail just makes the whole problem worse. Use an appropriate tool.