A while back I got Gmail to collect all my email from various accounts. It was great as they scanned it all for me and held it all in the one place to pick up. UNTIL!
Now I have more than 5 email accounts and Gmail will only do 5. So, Blue Mail goes back on the phone.
This has some benefits and some downfalls.
The downfalls are that I have to leave outlook going at home if I want the mail spam filtered as there is no good anti-spam apps for phones.
Outlook is running in IMAP and so are the phones. That means that once outlook (and Spam Bully) have moved spam to the spam folder it should duplicate this on the phones.
Hopefully, this will do the trick for spam.
The next issue is battery drain on the phone. Running all these email accounts is a stressor for the battery.
There is one other way to achieve this outcome and that is to forward copies to Gmail and only use that on the phones and let Gmail filter the messages.
I’ll let you know how it all works out.