add validation

ses-domain/ses_dns.md.tpl

@@ -58,3 +58,20 @@ ${mail_from}.${domain}. ${ttl} in txt "v=spf1 include:amazonses.com -all"
 ## DMARC Records
 
 Configuration of DMARC unknown at this time.
+
+# Valdation of records
+
+Once the DNS changes are done, you can validate them with these commands:
+
+```shell
+echo -n "in txt _amazonses.${domain}. "
+dig +short in txt _amazonses.${domain}. | grep -c "${validation_txt}"
+%{ for dk in dkim_tokens ~}
+echo -n "in cname ${dk}._domainkey.${domain}. "
+dig +short in cname ${dk}._domainkey.${domain}. | grep -ci "${dk}.dkim.amazonses.com"
+%{ endfor ~}
+echo -n "in mx ${mail_from}.${domain}. "
+dig +short in mx ${mail_from}.${domain}. | grep -ci "feedback-smtp.${region}.amazonses.com"
+echo -n "in txt ${mail_from}.${domain}. "
+dig +short in txt ${mail_from}.${domain}. | grep -ci "v=spf1 include:amazonses.com -all"
+```