Hi @Alyasalah,
First, if you haven't already, reference this article.
Also, reference this post where @edjusten provides resources for more specifics related to IMAP.
If you're still having issues, there could be something internally that's blocking the connection with HubSpot. We've seen that in the past. Their systems administrator had to make adjustments internally to allow the connection.
Hopefully the articles can get you rolling and it won't require more in depth troubleshooting.
Josh
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 | Josh Curcio We help tier 1 & 2 manufacturers generate leads!  HubSpot Gold Partner & HubSpot Certified Trainer |