Both times you sent the opt-in they were received by gmail, you need to make sure that the people look in their spam baxes, and they need to add server@toastmastersclubs.org and agenda@toastmastersclubs.org to their contact lists
Code:
Jan 26 15:06:06 toastmastersclubs sendmail[936076]: 60QF65EH936073: to= , ctladdr= (1001/1001), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=32976, relay=gmail-smtp-in.l.google.com. [142.250.31.26], dsn=2.0.0, stat=Sent (OK 1769439966 6a1803df08f44-894918b14e0si113016066d6.270 - gsmtp)
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Jan 21 21:46:30 toastmastersclubs sendmail[2259938]: 60LLkTTn2259935: to= , ctladdr= (1001/1001), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=32976, relay=gmail-smtp-in.l.google.com. [142.250.31.26], dsn=2.0.0, stat=Sent (OK 1769031990 6a1803df08f44-89478ec3d39si18928566d6.760 - gsmtp)
