email with attachments doesn't arrive at bcc addresses

[rosie]

I'm new to Roundcube. I've used the bcc field successfully many times.  Both today and yesterday I tried to send an email to myself with 50 bcc addresses with two attachments, 1 @ 33kb, 1 @ 28 kb.  The email arrives in my inbox, no error messages but no one else gets it.  I've seen postings about a php setting but I don't know where or what that is.  HELP!!!

[JohnDoh]

have you checked the smtp server logs to see the message was sent correctly? and things like spam filters on the recipient side?