# mautic.ERROR: \[MAIL ERROR\] Expected response code 250 but got an empty response

**URL:** <https://forum.mautic.org/t/mautic-error-mail-error-expected-response-code-250-but-got-an-empty-response/18704>\
**Category:** Product Support\
**Created:** [March 24, 2021, 6:04pm UTC](https://forum.mautic.org/t/mautic-error-mail-error-expected-response-code-250-but-got-an-empty-response/18704 "2021-03-24T18:04:26Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![mikew](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/mikew/32/5156_2.png) [@mikew](https://forum.mautic.org/u/mikew)\
**Post date:** [November 18, 2021, 6:31pm UTC](https://forum.mautic.org/t/mautic-error-mail-error-expected-response-code-250-but-got-an-empty-response/18704/7 "2021-11-18T18:31:28Z")

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We are experiencing the same issue with Mautic 4.0.1 with Amazon SES. The weird thing is that some emails are going through.

We are running a campaign with around 300,000 contacts, and I am seeing the log start to fill up and also noticing lots of failed events.

In the system log I am getting messages like this:

```auto
[2021-11-18 18:24:51] mautic.ERROR: [MAIL ERROR] Expected response code 250 but got an empty response (send); kfdsfd@wfdsf.com {"exception":"[object] (Swift_TransportException(code: 0): Expected response code 250 but got an empty response at /var/www/mautic/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:447)"} []

```

in the contact card I see this message and that it has been rescheduled to send later this evening:

 ![image](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/f/f38d0d34465bcdec170216fc3c1b398e1a31d775.png)

Not sure how to go about debugging this. So any ideas would be greatly welcome

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