When we get the Task reminder email, from field appear like Appian BPMS No

The e-mail from alerts is configured in custom.properties through the following property:

conf.mailhandler.ntf_sndr_addr=

while the display name ("Appian BPMS No Reply" in your case) is controlled by:

resources.appian.ap.application.appian.ap.appname=

The change requires a restart of the application server

Thnaks for your reply.

I have already have 'resources.appian.ap.application.appian.ap.appname=Appian Test' in my custome.proiperties file this will appear when i get alert notification.
Let me put it another way in send email configuration node-> setup tab how do i change in from drop down list?

See
forum.appian.com/.../Configuring_Custom_Email_Senders

The i18n localization file will hold the name that you want to display in the email node.