Cleaner, to extract items you need (e-mail addresses, IP addresses, phone numbers, etc.) from raw data files and process them to get the standard 1st Mailinglist Manager lists (that is sorted, one item per line, no duplicates).   Merger, to compare two lists, find and report matches and differences and merge the lists to obtain one complete list.   Remover, to extract from one list file the items included into one or more remove-list files (e. g. to exclude some e-mail addresses, stored in separate files, from your basic mailing list).   Filterer, to withdraw from your lists any unwanted types of e-mail addresses according to the options you indicate.   Keeper, to thin out your lists leaving only certain types of e-mail addresses according to the options you indicate.   Sampler, to produce a sample of a large list according to the options you indicate (e. g. every 10th item, random, etc.).   Separator, to separate the list of e-mail addresses by domains and then arrange the addresses within domain (sorts, randomizes, etc.).   Seeder, to include your own address(es) into your outgoing e-mail list the way you specify (e. g. every 50th item, 10 times evenly, etc) in order to monitor the deliverability of your e-mail messages.   Counter, to calculate for you some numbers describing your mailing lists (e. g. number of addresses within domains, etc.)   Splitter, to split one big list into a number of smaller ones according to the options you indicate (e. g. 20 files or 1000 items per file).   Utilities, to perform some auxiliary list processing tasks.   Automater, to make 1st Mailinglist Manager work automatically, executing the list management tasks without your in-between assistance.

If you have thousands of email addresses in multiple lists of your hard drive, then 1st Mailinglist Manager will help you to remove all duplicates to make sure people don't receive multiple mailings. You need to honor removal requests, verify email syntax before mailing,  removing certain email address types or even keep only certain domains, what about merging multiple lists together, and splitting lists into smaller parts. 1st Mailinglist Manager does all these jobs.