1. Installing sendmail won't resolve the issue. As default setup works fine and use postfix. You just messed up your setup.
2. Check postfix logs first and ensure that port 25 is open and you are not blacklisted.
My advice check 2. before jumping into changing configs that you don't master.
M B
2. Check postfix logs first and ensure that port 25 is open and you are not blacklisted.
My advice check 2. before jumping into changing configs that you don't master.
M B
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