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Asked: 2026-05-13T10:55:00+00:00

what is the main Logics between php mail(), sendmail(), using SMTP in php why

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what is the main Logics between php mail(), sendmail(), using SMTP in php

why we are creating noreply1@domain.com, noreply2@domain.com,… and so on. Is there any problem in this?

WE are building Newsletter management which we try to sent minimum 6000 mails per day. Our domain is in dedicated sever.

We are trying to sent 10,000 mails per day.

Which is the best solution.

I tried out swiftmailer it sent 4 mails and stoped with error message

“Unable to send message due to connection error”

some time it sent 100 and stopped.

What may be the problem is? Is it a coding problem or server problem

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  1. Editorial Team

    I think your first action should be to check the SMTP server you’re using (I assume you are using SMTP) whether it has any sending limits imposed. Then, speak to your ISP / provider whether they have any kind of spam detection in place that could prevent the sending of mass E-Mail.

    If you are not using SMTP, but mail(), switch to SMTP. Mail() opens a new connection for every outgoing mail and is not recommended for sending larger quantities.

    If nothing else helps, split the E-Mails into smaller jobs, making them easier for the server to digest, and/or add a few hundred milliseconds’ pause in between sending of each mail.

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