is it possible when mikrotik sent me email about critical events to include from which mikrotik identity is coming from?
i want this because i want to set one unique gmail to tools/email to all my customers. but when a mail is coming you cannot recognise which customer router it is.
it would be a nice feature and i wont have to make one gmail address per customer.

message should be something like this.... system,error,critical login failure for user admin from MY_MIKROTIK via ftp.

You could set the e-mail address to your_email_address+MY_MIKROTIK@gmail.com in each router (varying the MY_MIKROTIK for each router).
Then all mail will arrive in the same mailbox but you can still recognize it. Remember everything after the + is disregarded in e-mail addresses, and
can be seen as a comment but still be used in filtering on the mailbox (e.g. you could move every mail to a folder for that customer).

very good idea that i didnt think of, but it does not work.
the email i got in my inbox is from "mymikrotik@gmail.com" and not from "mymikrotik+AWS@gmail.com" that i have specify at sent to. do i have to you filters?

yes with filter is working but again you have to make so many filters.
is just simplier if mikrotik place "SYSTEM IDENTITY" at email that router sent.
i sent email to support@mikrotik.com

You could also send all logs to Sylog server like Splunk.
Then you can make an alert that send some logs to your email with the IP of the router it coming from.
Only minus with Splunk that Alert does not work with the free version of Splunk.

you cant see that info direct in gmail inbox . you have to open email and see the header details of the message. there you can see the specific sender. so this ok than nothing.
thank you pe1chl.