seems like am issue with the outlook cache mechanism to update the contact lists (From addresses). I tried reducing the cache period till the lowest… still sometimes i faced from address missing issue.
To eliminate this slow response - i did the everything on imap activity. it much better and faster. ( if you want to move it to imap → required to open a port imap port (25 / 143) for the mailbox)
there is a activity called “Get imap mail message” it’s similar to outlook mail activity…
for this require - imap port (25 or 143) and imap mail exchange address like ( imap.company.com)
you can refer below link for details of the activity