While not exclusively labeled "Baptist," these reputable Christian organizations provide similar free postal Bible studies:
Sends booklet-style courses for free, though they ask that you cover the return postage for grading. Sign up at IBTMinistries.org . What to Expect During the Course Tell Me More! - Bible Baptist Church
One of the largest providers, offering a series of six course books by mail. You can enroll via the College Hills Church site . free baptist bible correspondence courses by mail link
Several Baptist-affiliated organizations and traditional colleges offer free postal courses for adults, children, and those who are incarcerated.
Offers multiple studies, including the "Noteworthy Bible Course" and "The True Light Bible Course". Check their Correspondence Courses page for current availability. - Bible Baptist Church One of the largest
This ministry provides "Great Doctrines Of the Bible," a series of 36 lessons. You can earn certificates or a diploma by registering via mail.
Provides workbooks one at a time for self-study. After you mail back a completed quiz, they send the next book. Note that this is currently for U.S. residents only . Visit their Bible Courses page . There are no fees for enrollment
Rogma Director, Faith Baptist Bible College, P.O. Iringole – 683 548, Kerala, India.
Offers a completely free mail and prison correspondence program. There are no fees for enrollment, materials, or certificates. You can sign up through their Mail Correspondence Studies page.
Offers free courses for ages 3 to 100+ in English and Spanish. You can request materials at BibleStudiesByMail.org .