# Jenkins + Konakart Mail issue

**URL:** <https://forum.payara.fish/t/jenkins-konakart-mail-issue/305>\
**Category:** Technical Discussion\
**Created:** [April 21, 2022, 6:08pm UTC](https://forum.payara.fish/t/jenkins-konakart-mail-issue/305 "2022-04-21T18:08:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andreas](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@andreas](https://forum.payara.fish/u/andreas)\
**Post date:** [April 21, 2022, 6:08pm UTC](https://forum.payara.fish/t/jenkins-konakart-mail-issue/305/1 "2022-04-21T18:08:19Z")

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Hi,

i have a strange issue on my Payara since some Versions.

If Konakart is sending a Mail, i get this error:

21-Apr. 19:54:04 WARN (EmailSender.java:run:52) Problem Sending email (subject: Email From Tachyon Online) to [info@example.de](mailto:info@example.de)  
com.konakart.app.KKException: Error sending email: class io.jenkins.plugins.javax.activation.DelegatingCommandMap cannot be cast to class java  
x.activation.MailcapCommandMap (io.jenkins.plugins.javax.activation.DelegatingCommandMap is in unnamed module of loader jenkins.util.AntClassL  
oader @19a266b2; javax.activation.MailcapCommandMap is in unnamed module of loader org.apache.felix.framework.BundleWiringImpl$BundleClassLoad  
er @768b6f47)  
at com.konakart.bl.Emailer.send(Emailer.java:998)  
at com.konakart.bl.EmailSender.run(EmailSender.java:49)  
at java.base/java.lang.Thread.run(Thread.java:829)

]]

When i disable Jenkins, the mail is sent.

Any hints?

## Thx Andreas

Linux openSUSE Leap 15.3  
openjdk version “11.0.14.1” 2022-02-08  
Konakart Version 9.4.0.2  
Jenkins Version 2.344