We understand you are facing trouble with configuring custom mailbox for your existing support email address. Since you are using MS Office 365 email system, is SMTP enabled in your mailbox’s app settings?
How to check and enable IMAP and SMTP for O365 mailbox?
Log in to O365 Admin Center using O365 admin credentials.
Go to Users → Active Users and click on the email address for which a custom mailbox is configured.
In the pop-up window that comes go to “Mail → Manage email apps”
In “Manage email apps” window ensure “IMAP” and “Authenticated SMTP” are enabled.
Refer to this article to get detailed insights on configuring custom mailbox for your helpdesk. Let us know if this helps.
We understand you are facing trouble with configuring custom mailbox for your existing support email address. Since you are using MS Office 365 email system, is SMTP enabled in your mailbox’s app settings?
How to check and enable IMAP and SMTP for O365 mailbox?
Log in to O365 Admin Center using O365 admin credentials.
Go to Users → Active Users and click on the email address for which a custom mailbox is configured.
In the pop-up window that comes go to “Mail → Manage email apps”
In “Manage email apps” window ensure “IMAP” and “Authenticated SMTP” are enabled.
Refer to this article to get detailed insights on configuring custom mailbox for your helpdesk. Let us know if this helps.