My daughter needs to send me a large file. It appears that it is getting through my ISP, but being rejected on my CentOS mail server. The message she's getting says A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: anne at localhost SMTP error: 552 5.3.4 Message size exceeds fixed limit Reporting-MTA: dns; borg2.lydgate.lan I presume that this is a configurable limit, but I'm not sure where to look. Since it says MTA I'm thinking that it's probably postfix. Can someone please tell me what parameter I'm looking for? Thanks I have reams of documentation printed out. I'll start wading through that tomorrow, but time is of the essence with this one. Anne