On 1/22/2015 8:42 AM, Joe Acquisto-j4 wrote: > > A better analogy perhaps: it's as if the Postal Service refused to deliver an > envelope with one > addressee because it contained another envelope with several addressees on > it.
A better analogy is the post office refusing to deliver paint thinner, even with the proper postage. It's a policy decision, and well within their rights. The offending property of the message is the large number of addresses in the To: header. Many systems will refuse such mail as local policy. IMHO this is a reasonable policy; there's no good reason for a message to have hundreds of addresses in the To: and/or CC: headers, and there is a real possibility of it causing problems or complaints. Solution: don't send mail with hundreds of addresses in the To: and/or CC: headers. Whatever tool you're using to create this mail is broken and needs to be fixed. Ugly workaround until you fix your mail tool: use smtp_header_checks to mangle broken To: and CC: headers. Note: requires postfix 2.5 or newer. Note: if the mail is DKIM signed, this will likely break the signature. http://www.postfix.org/postconf.5.html#smtp_header_checks Something like: # main.cf smtp_header_checks = regexp:/etc/postfix/smtp_header_checks # smtp_header_checks # might need to adjust the 2000, I just made that number up. /^(To|CC): .{2000}/ REPLACE $1: Undisclosed recipients:; -- Noel Jones
