Sometimes it happens: you simply cannot send emails. You open your favorite mail client or software (AMS4.3, Turbo Mailer, , Gammadyne Mailer, SendBlaster…), write a few lines, insert the recipients’ addresses, click “Send” and… An error is returned. Why?

if you can’t send your emails, the problem is very likely (but not exclusively) related to your SMTP server – the server taking care of the whole email delivery process. That is why it’s always better to rely on a professional server.

And here’s a checklist to understand why you’re unable to send emails and troubleshoot any major problem:

1. Check your internet connection. So first of all, be sure that you’re connected to the internet!

2. Check your SMTP server details. This is an extremely common mistake: you have set up your mail client with the wrong SMTP parameters.
    For example: Smtp configuration: SSL: No - You configure: Yes.

3. Verify all usernames and passwords. Another small mistake that happens usually, so doublecheck your login details.
    When you copy and paste user & password. Please be careful with Whitespace character ( space bar on keyboard)
    For example: User: "abc@domain.com" | Password: "******" - You pasted: "abc@domain.com_" | Password: "******_"  ( _ is Whitespace character ).

4. Check your SMTP server connection. Now this is trickier: even if your SMTP details are correct, the server itself can be down or not functioning for some reason. Here’s a list of all the SMTP error
    codes to get your bearings; and remember again that using a professional outgoing server this won’t happen again.
    How to check ? 
          a. Open the search bar on Windows, type cmd
          b. Type the command: ping name_server_of_smtp
              
              As picture above: Your SMTP server is still working.

    Error "452 4.3.1 Insufficient System Resources"

              
    How to fix ?

5. Control your antivirus or firewall settings. Sometimes an outgoing mail server can conflict with the computer’s protection systems. So verify that your firewall or antivirus are not blocking it, setting up a proper exception rule.

6. Your RDP is blocked outbound SMTP port (port 25). How to fix ? Contact support to open port 25.
    Some RDP Providers were blocked outbound SMTP ( port 25 ):
    + RDP of Amazon.com
    + RDP of Azure.com
    + RDP of Google Clound
     ... 

    RDP USER WITH WITH AMS - Turbo Mailer & Gammadyne Mailer 1 DAY ( $5) OPEN PORT 25 : ORDER HERE