The best replacement for 587 is 607.

The best alternatives to 587 are rated as following:
★★★★★  607
★★★★  25
★★★★  597
★★★  465
★★★  579
★★  627
★★  kenworth t700
★★  590
★★  25 smtp
★  586
★  585
★  387
  port 25
  287
  607 be

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587
607
25