Popular topics: How many characters can I send in an SMS? How to get started with ClickSend

SMTP troubleshooting

Try to telnet to the server. 

Open up the commandline and run each of these commands. Let our support team know what the response is for each of them:


telnet smtp.clicksend.com 25
telnet smtp.clicksend.com 465
telnet smtp.clicksend.com 587
telnet smtp.clicksend.com 10001

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