Hi! Thanks for your analysis; I have one additional comment:
On Thu, 20 Feb 2020 23:28, Ángel said: > I suspect that the problem may not actually be the packet format, but > something else presented by the same client that is choosing new format > (e.g. it could be choosing IDEA as cipher). gpg support IDEA so that is can't be the problem. A more likely problem with older clients is that it does not support the MDC checksub we use for nearly 20 years. An easy test is to use the option --ignore-mdc-error for just this one message and if that works, asking the communication partner to update their software to something from the millenium. Salam-Shalom, Werner -- Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.
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