Getting Internal Server Error sending an email from Web Service

I am just created a web service - a simple wab app. It can not send a confirmation email during sign up process - it shows ‘Internal Server Error‘ in the browser. Locally it works ok. In the log I see this error:

[ERROR] Worker (pid:58) was sent SIGKILL! Perhaps out of memory?

I use django for my app and sending email using this django library:
from django.core.mail import EmailMultiAlternatives

Is this really an error related to not enough memory? I have free account with 512 MB RAM. Do I realy have to go to paid instance, and pay $25 a month just to be able to send an email? or it is another issue not related to RAM?

You might be running into this change that was made, Free web services will no longer allow outbound traffic to SMTP ports | Render Changelog.

Also, to be clear, the lowest cost paid instance type is $7 per month and not $25.

yes, I know, it is $7, but for $7 you will get th same amount of RAM - 512 MB. To get more RAM you will have to pay $25

I actually created a ticket with render.com, and they answered that SMTP ports are not available to free services, and their lowest paid instance for $7 would solve this

But thank you for your answer anyway

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