Office365 SMTP, POP3 and IMAP settings

» Email sending
To send emails using Office365 server enter these details:
SMTP Host: smtp.office365.com
SMTP Port: 587
SSL Protocol: OFF
TLS Protocol: ON
SMTP Username: (your Office365 username)
SMTP Password: (your Office365 password)
Also make sure that your:

1. "From" email in HESK settings (General tab) is set to your Office365 email address
2. "From" name in HESK settings (General tab) is NOT set to an email address - Microsoft security policies will reject sending emails if the From name is an email address

» POP3 fetching
To fetch mail from Office365 server enter these details:
POP3 Host: outlook.office365.com
POP3 Port: 995
TLS Protocol: ON
POP3 Username: (your Office365 username)
POP3 Password: (your Office365 password)

» IMAP fetching
To fetch mail from Office365 server using IMAP protocol instead, enter these details:
IMAP Host: outlook.office365.com
IMAP Port: 993
Encryption: SSL
IMAP Username: (your Office365 username)
IMAP Password: (your Office365 password)