Office 365 - cannot delete shared mailbox alias


Microsoft Office 365 shared mailbox secondary alias cannot be removed. I tried removing the alias via Office 365 Admin Center, Exchange Admin Center, and PowerShell (Set-Mailbox "" -EmailAddresses @{remove="This email address is being protected from spambots. You need JavaScript enabled to view it.;}). None of these methods works, it initially looks like the operation succeeds, but the alias is never removed.

The shared mailbox in question used to be a user's mailbox, and the alias in question used to be the user's primary email address. I also tried changing the mailbox username / login name, and email alias, but this didn't help either.

1&1 / ionos Exchange mailbox doesn't work on iPhone


1&1 (Ionos) hosted Exchange 2013 mailbox works fine in Outlook and via Webmail but doesn't work on iPhone. The account gets added to iPhone Passwords and Accounts without any errors (using server, but when in the actual Mail app, no emails get ever downloaded, and occasionally it pops up an error saying that connection to the server failed. 

View all archived email in Gmail

Archived emails in Gmail are simply emails with all labels removed. You can view them in "All Mail" view, but they are displayed alongside all other emails. To view only archived mail (i.e. emails with no labels) run following search:

has:nouserlabels -in:Inbox -in:Sent -in:Draft -in:Chat

Can't send emails through Office 365 SMTP - Client host blocked using Spamhaus


Windows server and Kyocera photocopier can no longer send emails through Office 365 SMTP server ( The issue started happening after ISP change (new ISP was UK's PlusNet). After checking PowerShell mail send script output I found following error:

Exception calling "Send" with "1" argument(s): "Mailbox unavailable. The server response was: 5.7.1 Service unavailable, Client host [] blocked using Spamhaus.


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