Email don't sent due to 421 SMTP error

Hi,

we upgrade to 22.1 and now we have issue with sending mail , using Sent mail smart service and also sending alerts on a task level.

The problem is that this does not happens with all of the mails.

I will like to review our mail setting and ask do we need following lines in custom.properties or not

conf.suite.MAIL_SCHEME=http
conf.suite.MAIL_SERVER_AND_PORT=localhost:8080

Our other setting is

conf.mailhandler.ntf_sndr_addr=mail@company.mk

conf.mailhandler.mail.smtp.host=smtpserver.company.mk:26

conf.mailhandler.email.domain=company.mk

conf.mailhandler.mail.smtp.auth=false

conf.mailhandler.mail.transport.protocol=smtp

Thanks in advanced.

BR,Natasa