Release 7.4.0

Bug Fixes

• mda: ensure 'Junk' folder is created when filing spam messages (fc6f198)
• mda: potential bugfix for the 2.4.3 macos/ios errors (77f9890)
• mda: revert changes (3626896)
• mta: remove unused local transport configuration and upstream proxy protocol setting (closes: #661) (2818419)
• mta: replace dockerize with envsubst for configuration templating and add wait-for-services script (e5df53f)
• restore original metrics (16c2cf2)
• sieve: add 'mailbox' requirement to ensure proper folder handling for spam messages (3e2884d)
• tests: correct spam header in integration test for sending junk mail (5472621)

Features

• hardened ciphers to pass tests at internet.nl (b553222)
• mda: upgrade to dovecot 2.4.2, simplified configuration (fixes #649, fixes #668) (963722c)