Test SMTP Gmail with Comm Operator

Comm Operator supports TLS (Transport Layer Security).

Here is the example about how to send Gmail with SMTP protocol in Comm Operator.

Download Comm Operator

Run Comm Operator, and connect Comm Operator with Gmail server IP address and Port Number.

Comm Operator - Gmail Server IP Address

You will receive message from Gmail server.

Comm Operator - Receive Message from Gmail Server

Check “Add CR”, and open Tools –> Options –> Carriage Return page to select “0D 0A”.

Comm Operator - Select Carriage Return

Input SMTP command according to SMTP protocol, click Send button or ENTER key on your keyboard to send the SMTP command to Gmail server. You will see the sent data and received data in the Log Data panel. Here “EHLO” is sent first.

Comm Operator - Send SMTP Command

Send “STARTTLS”, and click “TLS” button to show TLS setting panel. Input “smtp.gmaill.com”, click OK button to start TLS.

Comm Operator - StartTLS

Comm Operator - Start TLS

Send “EHLO” again.

Comm Operator - SMTP EHLO

After you send “AUTH LOGIN”, you will receive some base 64-encoded string. Copy it with “CTRL +C”.

Comm Operator - AUTH LOGIN

Open Calculator, paste the string to get the plain text. You will see it’s “Username”. That indicates the Gmail server is asking you the Username. You also need send base 64-encoded string to the server. With the help of the Calculator, you can get your username’s string easily.

Comm Operator -Calculator

Comm Operator - Converter

After you input the string of username (your Gmail account), you will be asked for password. It also shows in base 64-encoded string. Convert the password of YOUR Gmail account with the Calculator. After you send the password string, if it’s correct, you will receive “Accepted”.

Comm Operator - Accepted

Note: This is just an example. Please use your only Gmail account and password.

Send the command below.

“mail from:<serialporttools@Gmail.com>”

“RCP To:<support@serialporttool.com>”


Comm Operator - SMTP Command

You can send your email message now. Input “.” to end the message.

Comm Operator - Send SMTP Command

This mail is already sent! Check your mail box to be sure.

Comm Operator - Send SMTP Gmail Sccessfully

Here is the video about how to test SMTP Gmail with Comm Operator.

Test SMTP Gmail with Comm Operator

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