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Troubleshooting for sending emails when connected via Avast SecureLine VPN

 

When connected to Avast SecureLine VPN, you may experience problems while trying to send emails from email client, such as Microsoft Outlook, Mozilla Thunderbird or Apple Mail (Mac).

Avast SecureLine VPN has no impact on email behavior if you access your web based email account via an internet browser.

Instructions

Configuring outgoing SMTP server settings in your email client to use the port 465 or 587 and SSL/TLS encryption usually solves the issue.

To change SMTP settings in Microsoft Outlook:

  1. Click File and select Info from the menu.
  2. Click the Account Settings tile to open Email Accounts.
  3. Select your account from the list and click Change... to open your account settings.
  4. Ensure the correct hostname or IP address is entered for the Outgoing mail server (SMTP), as required by your email service provider.
    Note: We recommend to use a specific IP address of the SMTP server, especially if the provider use multiple SMTP servers. Read more....
  5. Click More Settings... to open Internet E-mail Settings.
  6. Select the Outgoing Server tab.
  7. Ensure My outgoing server (SMTP) requires authentication is enabled, and specify authentication method, if required by your email service provider.
  8. Select the Advanced tab.
  9. Change the port number for the Outgoing server (SMTP) to 465 or 587, based on requirements of your email service provider.
  10. Select SSL (or TLS) to enable an encrypted connection, if supported by your email service provider.
  11. Click OK, then Next and Finish to confirm your changes.
  12. Repeat these steps from step 3. for each email account you use.

To change SMTP settings in Mozilla Thunderbird:

  1. Select your account name from the left panel (represented as a parent folder of your Inbox).
  2. Under Accounts on the main screen, click View settings for this account to open Account Settings.
  3. Select Outgoing Server (SMTP) under Local Folders on the left.
  4. Select SMTP server from the list and click Edit... to open SMTP Server settings.
  5. Ensure the correct hostname or IP address is entered for the Server Name, as required by your email service provider.
    Note: We recommend to use a specific IP address of the SMTP server, especially if the provider use multiple SMTP servers. Read more....
  6. Change the Port number to 465 or 587, based on requirements of your email service provider.
  7. For Connections security select SSL/TLS encryption, if supported by your email service provider.
  8. Specify Authentication method, if required by your email service provider.
  9. Click OK to confirm your changes.
  10. Repeat these steps from step 4. for each SMTP server you use.
  11. Click OK to confirm your changes.

To change SMTP settings in Mail app on Mac:

  1. Click File and select Preferences... from the menu.
  2. Select Accounts from the toolbar.
  3. Select your account on the left, then click the Server Settings tab.
  4. Click the area next to Account under the Outgoing Mail Server (SMTP) and select Edit SMTP Server List... from the drop-down menu.
  5. Select your SMTP server from the list.
  6. Select the Server Settings tab below the list.
  7. Ensure the correct hostname or IP address is entered for the Host Name, as required by your email service provider.
    Note: We recommend to use a specific IP address of the SMTP server, especially if the provider use multiple SMTP servers. Read more....
  8. Untick the option Automatically manage connection settings.
  9. Change the Port number to 465 or 587, based on requirements of your email service provider.
  10. Tick the option Use TLS/SSL to enable an encrypted connection, if supported by your email service provider.
  11. Specify Authentication method, if required by your email service provider.
  12. Click OK to confirm your changes.
  13. Repeat these steps from step 5. for each SMTP server you use.

Further recommendations

If you are using Gmail or Windows Live we recommend to configure your email client to use a specific IP address of the SMTP server instead of its hostname (smtp.gmail.com or smtp.live.com), as these email service providers are known to use multiple SMTP servers.

Here is a partial list of IP addresses of the SMTP servers known to belong to Gmail:

74.125.136.108
74.125.133.108
74.125.142.108
74.125.143.108
173.194.66.16
173.194.66.108
173.194.66.109
173.194.67.108
173.194.67.109
173.194.70.108
173.194.70.16

Here is a partial list of IP addresses of the SMTP servers known to belong to Windows Live:

65.55.172.254
65.55.96.11
65.55.162.200

Since we have no control over these servers, we don't know the full list of IP addresses.

If you are still having trouble, consider that your email service provider may be restricting access. Some possible restrictions:
  • access blocked to datacenter IP addresses
  • access only allowed to residential IP addresses
  • access only allowed to IP addresses of its own country
  • access only allowed to certain internet service providers
  • Avast SecureLine VPN 5.x for Windows
  • Avast SecureLine VPN 3.x for Mac
     
  • Avast Ultimate 19.x
  • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
  • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit
     
  • Apple macOS 11.x (Big Sur)
  • Apple macOS 10.15.x (Catalina)
  • Apple macOS 10.14.x (Mojave)
  • Apple macOS 10.13.x (High Sierra)
  • Apple macOS 10.12.x (Sierra)
  • Apple Mac OS X 10.11.x (El Capitan)
  • Apple Mac OS X 10.10.x (Yosemite)
     

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