Basically there are 3 DNS records that I have copied from Amazon SES DKIM section. I have renamed the domain here but they are as follows:
zao4glpeguktqoefv2w2c3lotyhe5tay._domainkey.example.com
amc5h4kgpsrrkk4ceawwsaqsaihkj6gc._domainkey.example.com
2crahfca2qhlhk2v5zd3235mlw5f44jh._domainkey.example.com
Record type: CNAME
Value:
zao4glpeguktqoefv2w2c3lotyhe5tay.dkim.amazonses.com
amc5h4kgpsrrkk4ceawwsaqsaihkj6gc.dkim.amazonses.com
2crahfca2qhlhk2v5zd3235mlw5f44jh.dkim.amazonses.com
I have set it up for the domain example.com, but as I said there is Sendy on marketing.example.com.