Rewriting ‘From:’ in ssmtp/mail no longer works in Ubuntu 18.04

In Ubuntu 14.04 I had the following system running which is basically described here and also here. One element of this is that the ‘From:’ address is taken from /etc/ssmtp/revaliases: 

and the ‘’ was used as ‘From:’ when I issued a mail like echo -e “Hi there” | mail -s Test

In a new installation of Ubuntu 18.04, the ‘From:’ is now

 Clearname <username@hostname> 

where clearname is the name string in /etc/passwd, username is the linux username, and hostname is the linux host name (although changing it with ‘hostname’ does not alter the result).

Of course, this e-mail address is not going to work, I would like to supply my real address. It seems like new versions of GMail or SSMTP have broken this useful and essential feature.

I would be grateful for help!

Rewriting complex formal derivatives

Formal derivatives are given by the following formulas

\begin{align} \frac{\partial f}{\partial z} = \frac{1}{2} \bigg( \frac{\partial f}{\partial x} – i\frac{\partial f}{\partial y} \bigg) \ \frac{\partial f}{\partial \overline{z}} = \frac{1}{2} \bigg( \frac{\partial f}{\partial x} + i\frac{\partial f}{\partial y} \bigg) \end{align} I am to rewrite $ $ \frac{\partial \overline{f}}{\partial z}$ $ and $ $ \frac{\partial \overline{f}}{\partial \overline{z}}$ $

How can it be done? Am I to use Riemann — Cauchy equations? If yes how?

Rewriting sender address not working in postfix

I’m running postfix on a Raspberry Pi, with the goal of having mail sent from the Pi always look like it’s coming from my personal “external” email address (the Pi is never intended to receive mail).

I’ve tried to do this by setting up a sender rewrite hash like this:


which I then process with:

sudo postmap hash:/etc/postfix/sender_canonical_maps 

However, after restarting postfix (and confirming it’s running fine), when I send an email using mailx:

pi@mycroft:/etc/postfix $   mailx -s "Hello There!" mark dkdkd Cc:  

what arrives at the destination has a sender address of mark@mycroft.localdomain, which isn’t the desired result.

In case it matters, here’s what my /etc/aliases file looks like:

mailer-daemon: postmaster postmaster: root nobody: root hostmaster: root usenet: root news: root webmaster: root www: root ftp: root abuse: root noc: root security: root root: mark mark: 

Rewriting image output in views: how to provide replacement pattern inside twig tag?

In views I want to rewrite output of image field by using twig function drupal_image (see module Twig Tweak). When I provide the image path directly, this code works:

{{ drupal_image('public://myimage.jpg' , image_responsive_style, responsive=true) }} 

But I can not manage to provide image path by a variable, like this pseudocode:

{{ drupal_image('{{ uri }}' , image_responsive_style, responsive=true) }} 

The problem seems to be how to provide the variable {{ uri }} properly inside the surrounding twig tag.

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Rewriting a set of integers to get rid of repetition but keeping subset sum ordering

Say, I have a set of 6 +ve integers sorted in ascending order:

$ A = \{2,4,4,4,5,7\}$

Now to make it easier to deal with (Minimum one starts with 1) I deducted one from all of them:

$ \therefore B= \{1,3,3,3,4,6\}$

Now what I am trying to do is get rid of the repetition of numbers and I tried by keeping one number (4) and the rest same numbers in the incremental way (4,5) and the increased amount (+2) is added to the following numbers (4,6) after that.

$ \therefore C = \{1,3,4,5,6,8\}$

But I wanted to keep the subset sum ascending ordering, which seems like doesn’t now hold. For example:

For Set A: $ (2), (4), (4), (4), (5), (2,4)… $

Sums are: $ 2,4,4,4,5,6 …$

For Set C: $ (1), (3), (4), (1,3), (5), (6), (1,6)….. $

Sums are: $ 1,3,4,4,5,6,7…$

Up to this point it is fine. But what if I want to generate them from the original set $ A$ , and the problem is the order doesn’t not hold anymore!

For example:

For Set A: $ (2), (4), (4), (4), (5), (2,4)… $

Now if we replace 2 with 1, 4 with (3,4,5), 5 with 8 and 7 with 8:

It becomes: $ (1), (3), (4), (5), (1,3)…$

Now the sums are: $ 1,3,4,5,4…$ We see that subset sum ascending ordering doesn’t hold any longer $ (..,4,5,4..)$ .

Now my question is: Is there any way I can get rid of the repetition numbers i.e. they will become unique and the subset sum ordering will remain intact???

Postfix – address rewriting – reply all

I’ve a Red Hat Enterprise Linux Server release 7.6 (Maipo) with postfix version 2.10.1. I use it as relay only – no local mailboxes.

This server should be used to rewrite addresses. I’ve tried it with recipient_canonical and virtual. And in general it works. My problem is, that if the recipient get the mail and click on “reply to all” (e.g. in Outlook) I would excpect, only to see the sender address. But in fact I see the old (before rewritten) address of the recipient as well. This would mean that with “reply to all” “I” would send a mail to myself, using my old address.

Example: postfix receive the mail from sender@foo.tld to whoever@old_domain.tld. With recipient_canonical recipient address will be rewritten to whoever@new_domain.tld and postfix deliver this mail to the next hop. If now whoever@new_domain.tld press “reply to all” on his mail client sender@foo.tld appears (as expected), but whoever@old_domain.tld as well. This is not wanted.

What I do wrong here? Thank you very much in advance!

Supplement: At gmx I still see the old address and gmx put it in CC

recipient_canonical_classes = envelope_recipient, header_recipient

Rewriting Logitech MX Master drivers

I am currently using windows 10, but I really want to switch to Linux. However, the only thing holding me back is the lack of support for the MX Master 2S mouse, specifically the gesture features. In theory, if I were to try and write my own driver for the mouse, is there a chance it will work, or is it not a driver issue? Im sorry if this is a noob question, this is not a topic I am familiar with.