Several of us that are part of the leadership of a non-profit organization (specifically, a District within Toastmasters International), keep getting some of our outgoing emails "blocked". This appears to be a fairly random ocurance with no rhyme or reason. I've found responses to similar issues, but they (a) are several years old, and (b) essentially say "it's not our fault" - which is <bleep>. The latest event, for example, was the result of one of my fellow district officers sending an email to my personal account - something that he'd already done multiple times that day. Since I did receive his other messages, I'm not inclined to believe the 'explanation' I've seen that "the receiving service has flagged this domain as spam" - or whatever other nonsense is being claimed. Furthermore, the responses I've seen appear to be directed towards IT 'professionals', and not to someone who's just trying to get a message out to a colleague so they can support the organization they've volunteered to lead.