My mail.log file is huge

I looked through some of the logs and it seems to try to make 10-20 requests per second. I used to have SSH bot login attemps so I thought this was due to bots trying to break into my box, so I added some firewall rules but I still have the mail issue. I have never set up SMPT on my server nor plan on in the future so I just want these logs from filling up disk space so quickly. Any help would be appreciated!

Here are some example logs:

May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bm024443: to=root, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5701858, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bn024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5703365, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bj024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5703365, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bk024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5703552, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bo024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5704907, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bp024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5705095, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bl024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5705095, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bq024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5706661, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1br024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5709596, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bs024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5711161, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bt024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5711344, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bu024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5711452, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
May  3 06:41:09 lemp-s-1vcpu-1gb-nyc3-01 sm-msp-queue[28406]: 0429f1bv024443: to=postmaster, delay=20:58:06, xdelay=00:00:00, mailer=relay, pri=5711642, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]