chore: improve the test for senging e-mail by checking to, from and subject

Author: php-coder

src/test/robotframework/account/registration/logic.robot

@@ -20,6 +20,9 @@ After account creation an e-mail with activation link should be send
 	Log                     ${response.json}
 	Length Should Be        ${response.json['requests']}  1
 	${body}=                Set Variable  ${response.json['requests'][0]['body']}
+	Should Contain          ${body}  [email protected]
+	Should Contain          ${body}  My Stamps <[email protected]>
+	Should Contain          ${body}  [my-stamps.ru] Account activation
 	${linkRegexp}=          Set Variable  ${SITE_URL}/account/activate\\?key=[0-9a-z]{10}
 	${links}=               Get Regexp Matches  ${body}  ${linkRegexp}
 	Length Should Be        ${links}  1