Hello, In the Message; Subject : Re: [oS-en] Finding duplicates in email Message-ID : <4852bccf-a68a-f5fd-601c-3787df11d54c@telefonica.net> Date & Time: Tue, 4 Jul 2023 14:49:12 +0200 [CER] == "Carlos E. R." <robin.listas@telefonica.net> has written: [...] CER>>> Alternatively, I need a method to erase the "X-Spam-Status" header in many CER>>> thousand of emails. PS> > I am sure procmail/formail can do that but you will have to craft the recipie PS> > PS> > some possible examples to use: PS> > https://procmail.rwth-aachen.narkive.com/zC2aChER/using-formail-to-remove-he... PS> > https://www.linuxquestions.org/questions/linux-server-73/procmail-removing-h... CER> Thanks, I will have another look at formail. Seems -x or -X does it. Not my CER> first rodeo with it, but removing headers is new to me. Are you sure? -x headerfield Extract the contents of this headerfield from the header. Line continuations will be left intact; if you want the value on a single line then you’ll also need the -c option. -X headerfield Same as -x, but also preserves/includes the field name. Where does it say you can erase? You guys should understand what it means that an email is a legal voucher. Then you will know what not to do with incoming mail, and you will know that the authors of procmail and other mail utilities are using a format that does not compromise the legal significance of the mail. Fundamental question! In the Message; Subject : Re: [oS-en] Finding duplicates in email Message-ID : <c800e49f-6c34-b328-9b01-30af5a1bb4f3@telefonica.net> Date & Time: Tue, 4 Jul 2023 11:40:20 +0200 [CER] == "Carlos E. R." <robin.listas@telefonica.net> has written: [..] CER> I happen to have very complex procmail recipes. The result were CER> duplicates. [...] Can you tell me how to use procmail with Thunderbird, a MUA? I asked ChatGPT, but she said she doesn't know. Regards. --- ┏━━┓彡 野宮 賢 mail-to: nomiya @ lake.dti.ne.jp ┃＼／彡 ┗━━┛ "No Windows, no gains!" ... "Why, I am wrong?" -- Bill --