![]() ![]() It is also possible that your software/hardware firewall is configured to block some of the above ports, reconfiguring it or turning it off temporarily may help troubleshoot. Some mail servers are configured to also use port 2525 as an alternative to 25 unofficially. Notes: Residential ISPs often block outgoing mail ports for outside mail servers (that don't belong to that provider), like ports 25, 465, 587. If you can connect to the port, it indicates some other Outlook configuration issue, even though it can still be a firewall/anti-virus software problem. type: telnet hostname 25 (where hostname is the exact name of the SMTP server, and "25" is the port you'd like to test) If your ISP (or your firewall) is blocking the port, you will not be able to connect. Open Command Prompt (Start > Run > type: cmd) 2. Instead of a portscan, you can also try testing if a port is open on a specific host by doing the following: 1. Select TLS from the drop-down menu under Outgoing Server (SMTP). ![]() ![]() Here is a list of the default standard mail ports for your reference: SMTP - port 25 POP3 - port 110 POP3S ( POP3 over SSL, SSL- POP) - port 995 IMAP - port 143 IMAPS (IMAP4 over SSL) - port 993 SMTP mail submission - port 587 SMTPS (Secure SMTP, SSMTP) - port 465 You can also try scanning the above ports to see which one is open on your mail server using our portscan, and/or you can also contact your ISP to verify whether they are blocking any mail ports, port 25 is the most common one being blocked. Click Advanced and select SSL from the drop-down menu under Incoming Server (POP3). As an alternative, try port 2525, or one of the secure ports below. Under "Outgoing Server", make sure you check: "My outgoing server ( SMTP) requires authentication" and "Use same settings as my incoming mail server" In the "Advanced" tab: Select the correct type of encryption, and the correct ports for "Incoming server" (usually 110) and "Outgoing server ( SMTP)" - 25 is the default outgoing port, however, many major ISPs block this port to reduce outgoing spam, so if you're not using your ISP for email, it may be blocked and that is probably the culprit. Make sure the outgoing/incoming mail servers, your username and password are correct. If you continue to receive this message, contact your server administrator or internet service provider ( ISP)." Navigate to your email account settings in Outlook under: Tools > Account settings > highlight your account and click "change" > click "more settings" Look through all the tabs. Plus, it will notify you when messages arrive in your ProtonMail inbox and custom folders.When setting up Outlook, or after ISP network changes, it is a common annoyance to be unable to send/receive email with a message of this type: "Outlook cannot connect to your outgoing ( SMTP) e-mail server. Thus, users must also know the necessary IMAP settings to set up an email account, which allows it to send notification emails to any mail address you provide. ProtonMail also supports IMAP settings in addition to SMTP. ![]() Do not use your Login or Mailbox password. Option Description SMTP Host: 127.0.0.1 SMTP Port: 1025 TLS SMTP Username: Your full email address SMTP Password: Passwords get automatically generated from the Bridge. Note: The settings shown vary depending on your account. Select an account on the left, then click Server Settings on the right. To change these settings in the Mail app on your Mac, choose Mail > Settings, then click Accounts. You can operate the incoming mail server with either POP3 or IMAP. Use Server Settings settings in Mail to change options for an account’s incoming and outgoing (SMTP) mail servers. This is the only way these programs can receive incoming email to your IONOS mailbox. With this ProtonMail email configuration, you can access your ProtonMail account from any desktop or mobile app that supports SMTP. If you use a separate email client other than Webmail, such as Outlook, Thunderbird, or Apple Mail, you have to enter the address of the IONOS incoming server. It aims to create an internet that respects privacy and is protected against cyberattacks by automatically encrypting and decrypting email as it enters and leaves the computer. ProtonMail is a simple, secure email service with built-in end-to-end encryption and cutting-edge security features. ![]()
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