We will hold on to the traditional view that Paul wrote 2 Thessalonians and he wrote it from Corinth.
It seems that there was a forge letter of Paul sent to Thessalonica. The problem was about the coming of the Lord and the guarantee of salvation. They could have believed that the Lord had already arrived but secretly. They could have believed that how they lived was irrelevant, because their salvation was guaranteed; nothing they did could modify the divine decision. Thus Paul had to deal with these problems and sent another letter, marked by his handwriting (3:17). This letter could have been written soon after 1 Thessalonians, perhaps within 12 months in AD 50 or 51.
Three purposes are evident from the contents of the epistle. Paul wrote to encourage the Thessalonian believers to continue to persevere in the face of continuing persecution (1:3–10). He also wanted to clarify events preceding the day of the Lord to dispel false teaching (2:1–12). Finally, he instructed the church how to deal with lazy Christians in their midst (3:6–15).
Apostolic tradition regarding the second coming (1:3–2:17);
a). Exemplified in the perescution of the Church (1:3–12);
b). The controversy concerning the second coming (2:1–12);
c). Encouragement to stand fast in the faith (2:13–17);
Other apostolic traditions (3:1–15);
a). The apostolic ministry: pray for and obey them (3:1–5);
b). Holiness: practice orderliness by hard work (3:6–13);
c). Unity: Admonishing the disobedient (3:14,15);
Benediction and Farewell (3:16–18).