Auburn used to play Tennessee and Florida every year for many decades. They lost those rivalries, Tennessee by choice (which is why we briefly had Alabama and Arkansas every year) and Florida when they went to SECWest.
Thank you. I learned something today. Never thought the source would be VolNation lol

lol:
Close, but not entirely correct. Along with playing Alabama, Vanderbilt, & Kentucky annually, Tennessee used to also play Auburn every year. Auburn also played Florida yearly, albeit in a stronger (and older) rivalry. Tennessee continued to play each team annually until 1991, the year before the SEC split into divisions.
After Arkansas and South Carolina joined the SEC, the conference split into two 6-team divisions, and adopted a scheduling method of 5 same-division games, 2 permanent opposite division games, and 1 rotating opposite division game (a home and home), or to put it simply: a 5-2-1 method of scheduling. Among its rivalries with the now East division teams, Auburn's rivalries with Georgia and Florida were both felt by the SEC to be the more significant ones and maintained as the 2 permanent opposite division opponents.
Tennessee was given Alabama as a permanent opposite divisional games, and Arkansas became our other permanent opposite division game. This came about from a combination of the SEC front offices pairing Tennessee with Arkansas mostly to try to create a natural rival which they hoped could "take off" as Arkansas and Tennessee shared a natural border (similar to why they paired Arkansas and Missouri now) and the SEC felt it balanced a bit better to have Ole Miss as UGA's 2nd permanent West opponent at (it's closer) rather than pairing them up with Arkansas (where there'd be even less connection).
(Other pairings included The offices included LSU w/ UF+UK, Bama w/ UT+Vandy, UGA w/ AUB+Ole Miss, UF w/ AUB+LSU, etc).
The conference kept the 5-2-1 schedule model for 10 years (from 1992-2002...that's why we played Arkansas every ). After that period, though, the conference teams and coaches voted to instead switch to a
5-1-2 model: 5 same division games, 1 permanent cross-divisional opponent, 2 rotating opposite division opponents. I'm not sure if this was done because it was felt teams weren't playing each other enough or if some coaches were upset that their schedules were regularly tougher than some others. When the new model was implemented, the UGA-AUB rivalry was felt to be the bigger rivalry and the SEC maintained it as the yearly East-West game between the two. This meant the until 2002 yearly UF-AUB matchup had to be dropped as an annual rivalry (and UF was paired with LSU).