PS> And don't forget that this just enables MYOB to put the emails in Outlook's Outbox - to actually send the messages you may need to start Outlook at some stage (if not already running), then click on 'Send / Receive All'. Windows Registry Editor Version this helps! *** Note, as Microsoft 365 moves on down the track, you may need to change '16.0' below to the newer version, but as of July 2020 it works as is *** The solution (which worked for me) was to add all of the following registry entries ( hint: if you don't know how to use regedit, simply select the code text below, copy/paste into Notepad, then 'save as' outlookfix.reg, then double-click that saved file to 'merge' these settings for you - will prompt you several times for permission): It took ages to sift through other forums (not MYOB related) before I stumbled on to the solution (credit to: ) The box to Always ask before opening this type of file is checked and greyed out, thus, not allowing me to disable this warning. (or if that was greyed out, you could try 'right-click' Outlook / run as administrator, then the setting was available).īUT! As of Outlook 16.0 (and in particular Office 365 aka Microsoft 365) that is not enough!!! In Outlook 2016, when I try to open an email file attachment, it results in a pop up that asks/warns 'You should only open attachments from a trustworthy source.' It provides the options to Open, Save or Cancel. If you have a user that always wants to be asked for creds when opening Outlook create the following reg keys. If you are wondering why the always prompt for credentials is greyed out in later outlook versions, thats apparently just how it is now. and change the setting to 'Never warn me about suspicious activity' Outlook Always prompt for logon credentials greyed out.

Under older versions of Outlook, you could set up Outlook to 'never warn' by:įile / Options / Trust Center / Trust Center Settings / Programmatic Access If this is unexpected, click Deny and verify your antivirus software is up-to-date.įor more information about email safety and how you might be able to avoid getting this warning, click Help.' 'A program is trying to send an email message on your behalf. I am going to guess you mean that trying to send emails via Outlook result in a pop-up:

Hi, I've just been through this problem myself.

Outlook attachments greyed out