Ok, long story short, Mail.app refuses to download email from one of my work's Exchange server for some reason, despite happily downloading from another Exchange server (5 email accounts setup, 2 IMAP, 3 Exchange; don't ask why). iOS Mail app happily reads data from the Exchange server, but never returns anything when searching. OWA sees all the email fine but regularly refuses to send email and just files it in Drafts instead of sending. Several colleagues have this issue, on both Mac and Win10, including when using Outlook. Anyway, the server admins for Work#2's Exchange server are useless beyond belief, and just blame everyone else for their ridiculous server setup. Im now at the point where I need to fix it on my end so that I don't end up wasting an hour a day on the phone to the hosting company, and end up missing critical emails. So, looking for suggestions on alternative Mail apps I can try. Stipulations: Cannot be cloud indexed or offshore data from this exchange server. Sensitive information goes through email account. (i.e. Spark mail is out). Must work well with sub-folders on IMAP accounts for filing, and not magically create a hierarchy of its own folders to lose email in (screw you Airmail for messing up my filing system) Needs to play well with sending email from multiple accounts, and being able to BCC the appropriate email account (Yeah, Airmail you suck at that too) Prefer it to have a free demo so I can find out about all of these issues without having to buy it first. Suggestions?