Here are the correct settings you should use to connect HESK to Office365.com
» 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:
"From" email in HESK settings (General tab) is set to your Office365 email address
"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)
» Error messages
Connection timed out
Could not connect to...
Testing connection, this can take a while...
This usually means required ports are blocked on your server in the firewall.
Contact your hosting company to verify and ask them to unblock required ports (587, 995 and/or 993) to allow TCP connections.
Password error: Logon failure: unknown user name or bad password.
Too many login failures
Office365 doesn't recognize your username or your password is incorrect. Double-check both the username and password. Passwords are CaSe SeNSiTiVe.
554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied
Make sure the "From" email (HESK settings > General tab) is set to the SMTP email address and that the "From" name is NOT set to an email address.
Outlook for Office 365 Outlook for Office 365 for Mac Outlook 2019 Outlook 2016 More...
In order to add your email account to Outlook, Outlook on the web, Outlook.com, or the Mail and Calendar apps for Windows 10, you'll need several pieces of information including the type of account, the incoming and outgoing server names, and the SSL and port settings. Your email provider can give you these settings, but we've provided the settings for the most popular email providers below.
If you're using a common email service, such as Outlook.com or Gmail, use this table to find your email provider's incoming (IMAP or POP) and outgoing (SMTP) server settings.
TIP: Unsure who your email provider is? Look at your email address. The word immediately after the @ symbol is usually your email provider.
Email Provider
IMAP Settings
POP Settings
SMTP Settings
AOL (including Verizon.net)
Server: imap.aol.com
Port: 993
Encryption: SSL/TLS
Server: pop.aol.com
Port: 995
Encryption: SSL/TLS
Server: smtp.aol.com
Port: 465
Encryption: SSL/TLS
Gmail
Server: imap.gmail.com
Port: 993
Encryption: SSL/TLS
Server: pop.gmail.com
Port: 995
Encryption: SSL/TLS
Server: smtp.gmail.com
Port: 465
Encryption: SSL/TLS
iCloud
Server: imap.mail.me.com
Port: 993
Encryption: SSL/TLS
Server:
Port:
Encryption:
Server: smtp.mail.me.com
Port: 587
Encryption: STARTTLS
MSN
Server: imap-mail.outlook.com
Port: 993
Encryption: SSL/TLS
Server: pop-mail.outlook.com
Port: 995
Encryption: SSL/TLS
Server: smtp-mail.outlook.com
Port: 587
Encryption: STARTTLS
Office 365
Server: outlook.office365.com
Port: 993
Encryption: SSL/TLS
Server: outlook.office365.com
Port: 995
Encryption: SSL/TLS
Server: smtp.office365.com
Port: 587
Encryption: STARTTLS
Outlook.com
Hotmail.com
Live.com
Server: outlook.office365.com
Port: 993
Encryption: SSL/TLS
Server: outlook.office365.com
Port: 995
Encryption: SSL/TLS
Server: smtp.office365.com
Port: 587
Encryption: STARTTLS
Yahoo!
Server: imap.mail.yahoo.com
Port: 993
Encryption: SSL
Server: pop.mail.yahoo.com
Port: 995
Encryption: SSL
Server: smtp.mail.yahoo.com
Port: 587 or 465
Encryption: TLS/STARTTLS or SSL
If your email is from a regional email provider, use this drop-down box to find your email provider's incoming (IMAP or POP) and outgoing (SMTP) server settings. If you still can't find your provider, visit your email provider's website and contact their technical support.
Here are the correct settings you should use to connect HESK to Office365.com
» 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:
"From" email in HESK settings (General tab) is set to your Office365 email address
"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)
» Error messages
Connection timed out
Could not connect to...
Testing connection, this can take a while...
This usually means required ports are blocked on your server in the firewall.
Contact your hosting company to verify and ask them to unblock required ports (587, 995 and/or 993) to allow TCP connections.
Password error: Logon failure: unknown user name or bad password.
Too many login failures
Office365 doesn't recognize your username or your password is incorrect. Double-check both the username and password. Passwords are CaSe SeNSiTiVe.
554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied
Make sure the "From" email (HESK settings > General tab) is set to the SMTP email address and that the "From" name is NOT set to an email address.
Outlook for Office 365 Outlook for Office 365 for Mac Outlook 2019 Outlook 2016 More...
In order to add your email account to Outlook, Outlook on the web, Outlook.com, or the Mail and Calendar apps for Windows 10, you'll need several pieces of information including the type of account, the incoming and outgoing server names, and the SSL and port settings. Your email provider can give you these settings, but we've provided the settings for the most popular email providers below.
If you're using a common email service, such as Outlook.com or Gmail, use this table to find your email provider's incoming (IMAP or POP) and outgoing (SMTP) server settings.
TIP: Unsure who your email provider is? Look at your email address. The word immediately after the @ symbol is usually your email provider.
Email Provider
IMAP Settings
POP Settings
SMTP Settings
AOL (including Verizon.net)
Server: imap.aol.com
Port: 993
Encryption: SSL/TLS
Server: pop.aol.com
Port: 995
Encryption: SSL/TLS
Server: smtp.aol.com
Port: 465
Encryption: SSL/TLS
Gmail
Server: imap.gmail.com
Port: 993
Encryption: SSL/TLS
Server: pop.gmail.com
Port: 995
Encryption: SSL/TLS
Server: smtp.gmail.com
Port: 465
Encryption: SSL/TLS
iCloud
Server: imap.mail.me.com
Port: 993
Encryption: SSL/TLS
Server:
Port:
Encryption:
Server: smtp.mail.me.com
Port: 587
Encryption: STARTTLS
MSN
Server: imap-mail.outlook.com
Port: 993
Encryption: SSL/TLS
Server: pop-mail.outlook.com
Port: 995
Encryption: SSL/TLS
Server: smtp-mail.outlook.com
Port: 587
Encryption: STARTTLS
Office 365
Server: outlook.office365.com
Port: 993
Encryption: SSL/TLS
Server: outlook.office365.com
Port: 995
Encryption: SSL/TLS
Server: smtp.office365.com
Port: 587
Encryption: STARTTLS
Outlook.com
Hotmail.com
Live.com
Server: outlook.office365.com
Port: 993
Encryption: SSL/TLS
Server: outlook.office365.com
Port: 995
Encryption: SSL/TLS
Server: smtp.office365.com
Port: 587
Encryption: STARTTLS
Yahoo!
Server: imap.mail.yahoo.com
Port: 993
Encryption: SSL
Server: pop.mail.yahoo.com
Port: 995
Encryption: SSL
Server: smtp.mail.yahoo.com
Port: 587 or 465
Encryption: TLS/STARTTLS or SSL
If your email is from a regional email provider, use this drop-down box to find your email provider's incoming (IMAP or POP) and outgoing (SMTP) server settings. If you still can't find your provider, visit your email provider's website and contact their technical support.