..or you are sending to a Microsoft-hosted email like @outlook.com, @hotmail.com or @live.com and they have decided that your sending server is spammy. In that case they will silently drop your mail.
..or you are sending to a Microsoft-hosted email like @outlook.com, @hotmail.com or @live.com and they have decided that your sending server is spammy. In that case they will silently drop your mail.