David

Hi there @caitlynhagerman,

Thanks for reaching out! It looks like there may be an issue with your SendGrid API key. When you get a moment, please generate a new API key and update it in the plugin by following the guide here: https://wpmailsmtp.com/docs/how-to-set-up-the-sendgrid-mailer-in-wp-mail-smtp/#api-key.

I hope that helps! Have a great day!

Hi there @innervisions,

It sounds like you’re hitting a sending limit imposed by your mailer service. While WP Mail SMTP does not have sending limits, mailer services typically will. You might be hitting a bulk mail limit or a rate limit that they have set up.

Try contacting your mailer service and asking them about this. They should be able to tell you what your limits are. You may be able to upgrade your account with them to gain a higher sending limit.

Additionally, please know that different services have different limits, so if one is working out for you, you can switch to another mailer service and go from there.

I hope that helps! Have a great day!

Hi there @rodrigopinho,

Thanks for reaching out! When you get a moment, please send over the XML to us via the contact form at WP Mail SMTP here: https://wpmailsmtp.com/contact/ This way our development team can take a look at the file and further investigate what might be happening.

Thanks!

Hi there @cw1210,

Thanks for reaching out! According to the error message, the SMTP server you’re connecting to is rejecting the email because it thinks it contains spam content. Basically, your email is triggering their spam filters, and they are refusing to send it. You could try contacting your SMTP provider about it to find out what rule you might be triggering. It may be a getting misflagged, or there may be part of your email that needs to be changed.

Additionally, you can try sending through another mailer service. Check out this guide in our documentation. It walks through each mailer we support and includes the benefits of each: https://wpmailsmtp.com/docs/a-complete-guide-to-wp-mail-smtp-mailers/

I hope that helps! Have a great day!

Hi there @dasys,

Thanks! We’re glad you’re liking our plugin. We hope it continues to impress for a long time to come.

Have a great day!

Hey there @jgking ,

Thanks for stopping by to leave a rating and a review! We’re glad to hear that our plugin was easy to set up and that it’s been working well for you. We hope it continues to serve you well for years to come!

Have a great day!

Hi there @muhittingoktas,

Thanks for taking the time to leave a rating and a review. We’re glad to hear that our plugin has been easy to use and that you rated it 5 stars! We hope it continues to run well for you for a long time to come.

Have a great day!

Hi there @hemant112233,

I do apologize for the delay.

If your site is being targeted by spam bots, captchas can usually help. However, it is important to note how captchas work. They are intended to prevent a spam bot from submitting a form. When they work, any data the spammer tries to send will never reach WP Mail SMTP because it will be stopped at the form level.

If spam is getting through, it means the spammer is either sending the spam through some other method (perhaps another form), or they are getting through the captcha. Depending on the type of captcha you are using, this could be possible, as some captchas are much easier to avoid than others.

Try sending a test email using only WP Mail SMTP. You can use the Email Test feature in the Tools section. If that email gets through, it means the issue is likely on the form or captcha side of things.

However, if the Email Test from within WP Mail SMTP does not go through, try redoing your connection to Outlook, specifically the SMTP Password. Microsoft requires the use of App Passwords for SMTP connections, so you won’t be able to use your regular Outlook password. Instead, you’ll need to create an App Password to connect with.

We have details on how to create one here: https://wpmailsmtp.com/docs/how-to-set-up-the-other-smtp-mailer-in-wp-mail-smtp/#secure-outlook

Also, you can check your Outlook account’s Sent folder to see if emails are showing there. If they are, it means they at least made it to Outlook.

Regarding the error message you originally posted, you would need to check with Outlook to find out more about it, or install a logging plugin like WP Mail Logging to capture a copy of the email that was sent when the error occurs. There would be something about that email that Outlook isn’t accepting, and given the custom code and the spam bots, it could be either one.

I hope that helps! Have a great day!