Specifies the type of subscription report that should be mailed to list administrators.
| Key | Description | 
| none | Do not email sub/unsub delivery reports to list admins | 
| monthly | Monthly: send a standard monthly report on the 1st of the month | 
| monthly-email | Monthly: send a detailed monthly report on the 1st of the month | 
| monthly-nochart | Monthly: send a short monthly report on the 1st of the month | 
| daily | Daily: send a standard report every day | 
| daily-email | Daily: send a detailed report every day | 
| daily-nochart | Daily: send a short report every day | 
| monday | Weekly: every Monday send a standard weekly report | 
| monday-email | Weekly: every Monday send a detailed weekly report | 
| monday-nochart | Weekly: every Monday send a short weekly report | 
| tuesday | Weekly: every Tuesday send a standard weekly report | 
| tuesday-email | Weekly: every Tuesday send a detailed weekly report | 
| tuesday-nochart | Weekly: every Tuesday send a short weekly report | 
| wednesday | Weekly: every Wednesday send a standard weekly report | 
| wednesday-email | Weekly: every Wednesday send a detailed weekly report | 
| wednesday-nochart | Weekly: every Wednesday send a short weekly report | 
| thursday | Weekly: every Thursday send a standard weekly report | 
| thursday-email | Weekly: every Thursday send a detailed weekly report | 
| thursday-nochart | Weekly: every Thursday send a short weekly report | 
| friday | Weekly: every Friday send a standard weekly report | 
| friday-email | Weekly: every Friday send a detailed weekly report | 
| friday-nochart | Weekly: every Friday send a short weekly report | 
| saturday | Weekly: every Saturday send a standard weekly report | 
| saturday-email | Weekly: every Saturday send a detailed weekly report | 
| saturday-nochart | Weekly: every Saturday send a short weekly report | 
| sunday | Weekly: every Sunday send a standard weekly report | 
| sunday-email | Weekly: every Sunday send a detailed weekly report | 
| sunday-nochart | Weekly: every Sunday send a short weekly report | 
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