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Explanation: or "envelope-stuffing line", if only for letters, as you stated (they exist for packages as well, in which case "mailing line"
If it's just a machine for letters, then "envelope-stuffing machine"
According to internet searches, they can be manual, too, so I would not put "äutomatic" unless it is clear from context.
BESTA" TRANSFER AGENT Ltd.
Printing and envelope-stuffing line. The configuration used in BESTA's mailing room has been ... www.besta.com.pl/en/printing_line.html - 7k - Cached - Similar pages
"BESTA" TRANSFER AGENT Ltd.
... BESTA is capable of meeting client requirements because it owns the most modern
and fastest printing and envelope stuffing line in Poland. Its printing ... www.besta.com.pl/en/offer.html - 9k - Cached - Similar pages
Hobbs the Printers
... customer agreed to officially open our new fulfilment floor and start the new mailing
line. A lot of Croner work will flow through this department, and we see ... www.hobbstheprinters.ltd.uk/fulfilment.html - 15k - Cached - Similar pages
... one of the most comprehensive printing factories in the UK Second mailing line
completes £6m investment programme The final pieces of the address directly ...
Text version - Similar pages
Theodore Quester United States Local time: 07:14 Native speaker of: English PRO pts in pair: 16
1 hr confidence:
(letter) inserter lines
Explanation: just inserter.
Mats Wiman Sweden Local time: 13:14 Native speaker of: Swedish PRO pts in pair: 1498