I propose to add additional validation for sender name in email field.

1. Validate < and > in sender name. Like (NOT < and NOT>) <(valid email address)>

Steps to reproduce:
Type <[email protected]>,<[email protected]>,<[email protected]> in one row
Result: message will sent to three emails [email protected], [email protected] and [email protected]
Expected: Invalid email address

Type <lalala><[email protected]>
Result: email will sent to "\"[email protected]/lalal"@zabbix.comaaa4"@bbb.bbb
Expected: Invalid email address

2. Add trim after email, and before if entered only email address
Steps to reproduce:
Type [email protected] with space in the end
Result: Invalid email address "[email protected] ".
Expected: successfully added

Type [email protected] with space before email
Result: Invalid email address " [email protected]".
Expected: successfully added