External Domain error - Send Email node

KNIME Analytics Platform
1

Hello,

I’ve a workflow running by batch every night which ends with a “Send Email” node. This node sends an email to a Microsoft Teams email address, so that the members of the corresponding Teams Channel get a notication that the program has ran properly.
This used to work for several months, but is no longer working since the beginning of the week unfortunately, with the following error message :
ERROR Send Email 3:315 Execute failed: This error occurred while communicating with the SMTP server: "com.sun.mail.smtp.SMTPSendFailedException: 550 5.5.105 Message rejected. External sending is not supported for High Volume Email accounts. This message cannot be delivered to external recipients. Please remove any external recipients and try sending again.

The profile I’m using to send the email is a special Microsoft account called High Volume Email (HVE) and one of the restrictions is that you can’t use that for sending email to external email domains - but now it seems MS define their own @teams.ms as an external domain and block that traffic.

Would you know any workaround solution that I could apply? Specially in such a non interactive workflow (running by batch)?

Thanks in advance for your support!

Amélie

2

Hi Amélie,

it sounds to me like your actual problem lies entirely outside of KNIME. The mail is being transmitted correctly to MS Exchange, which then rejects it because @teams.ms recipients seem to be disallowed by your HVE account. You’ll either have to use a different SMTP account to send the mail or first send it to an internal address and forward it from there to the Teams address.

– Leo

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3

Thanks Leo for the tricks!
I’ll try that and keep you posted,

Regards,

Amélie

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