You would often see emails arriving in your mailbox perfectly, but you would not be able to send emails. When you find yourself in a similar situation, the first thing you should verify is that your email client is configured properly. You can use the following email client settings according to your service with AccuWebHosting.
Windows Shared Hosting Customers
| Without SSL | With SSL |
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Linux Shared Hosting Customers
| Without SSL | With SSL |
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VPS Hosting Customers
| Without SSL |
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By default, SSL/TLS would not be configured in Linux (Dovecot) and Windows (SmarterMail) mail servers. You can follow the tutorials below to secure SmarterMail and Dovecot mail servers, respectively.
ISP Blocking Port 25
When you cannot send emails, the problem is likely with your Internet service provider. Your Internet service provider might be blocking outgoing port 25 as a safeguard against their connections being used to send spam. While you attempt you send an email through an email client installed in your local computer, it will use port 25 to transmit data to remote email servers. If your ISP is blocking port 25, your email won't be delivered.
How Do I Determine If Port 25 is Blocked?
To verify whether your ISP blocks port 25, open the command prompt (Start >> Run >> cmd + enter) on your local computer and run the following command.
telnet mail.domain.com 25 // Replace your domain name with domain.com. VPS customers replace mail.domain.com with VPS IP address.
If you get a failure message, no response, or a message similar to the following, port 25 block is most probably the issue here.
Trying 192.168.1.1...
telnet: Unable to connect to remote host: Connection refused
If you receive a similar response, port 25 is not blocked.
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
220 hostname.home ESMTP MailEnable Service, Version: 9.00-- ready at 10/09/15 10:31:13
If you receive the following error while running the telnet command, it indicates that telnet is disabled in your local computer. Check out the article " How to enable telnet command "
'telnet' is not recognized as an internal or external command, operable program or batch file.
Note: It is recommended to use the bulk email checker service before starting an email campaign.
