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How to remove port 25 restrictions from my lambda service?

Hi Guys,
I implemented SMTP changes which works perfectly on local server and then I learnt the lamda function implementation just to find out that it doesn't work in Port 25... It's been two days since I got stuck on this. Is there any way to get over this? It's so frustrating for me now.
I tried removing the same by filling their request form. But they did not respond.
I am using free tier for now.
Guys, please let me know if you know something to get over this. Or any other platform i can switch to from aws lamda? Please help me!

on October 1, 2023
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    Most ISP blocks port 25 anyway. Use port 587 for SMTP, it supports TLS too.

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      Actually its been more than a month I posted this. I went with other servers which allows port 25 and implemented the same.
      Still thank you for helping. Need more people like you!