Add sender to my postfix out of office mails which are sent with an empty sender

The RFCs say that out of office mails and other MDNs should be sent with an empty sender. Since Exchange 2010 (or 2007?), that is what it is done.

The problem is that at least Gmail and Hotmail refuse those mails:

status=bounced (host[] said: 550 Requested action not taken: mailbox unavailable (in reply to MAIL FROM command))

Internet says that we can’t add a sender to those out of office mails in Exchange 2010. There are transport rules but they can’t add “From” attribute in header, and email rewriting but… Its like asking me to write a big book in chinese while I just want to have a “cool” chinese character on my arm.

My luck is that my exchange sends mail via a postfix server (Internet -> Postfix -> Exchange) and that we can add sender to mails with postfix.

What I understand is that I can replace things like “*” to a single static mail address, always the same, that I can choose like “” but what I would like to do is add the real sender mail address to the “from”. And I would like to do this only if it is a “automatic reply” kind of mail.

How could I add a “from” value to my out of office mails so that gmail and other external mail servers accept my MDNs please?

NB: out of office works internally, the logs says it goes out of Exchange 2010 to go to Postfix (without any sender), that Postfix sends it out to the sender without any sender and the destinator bounces it back with the error ” status=bounced (host[] said: 550 Requested action not taken: mailbox unavailable (in reply to MAIL FROM command))”

Can’t log in to remote unix machine: No supported authentication methods available (server sent: publickey)

I’m trying to connect to my university’s linux machines to do an assignment, but as of today I get this error when trying to login using Putty/WinSCP (no matter what login i use):

No supported authentication methods available (server sent: publickey)

It worked yesterday and the machines are online. What does this error mean and how can I fix it? Most of the questions I’ve seen regarding this error come from people making servers, so their fixes havent really helped me/confused me. I’m not experienced with this kind of stuff at all

How do client and server authenticate random number which is sent

Both a client and a server send their random number each other in the ClientHello and ServerHello of handshake protocol of TLS. At the time, how do they authenticate the client or server which they want to communicate?

They make sure that the same ones if the session is the same because there is Certificate and CertifcateRequest after ClientHello.

Could you please help me for understanding. Thank you!

Unable to set the ‘FromName’ in email sent by SMTP

I am using SMTP to send emails in my custom module. But I am not able to set the ‘FromName’ of the email. I tried both hook_mail() and hook_alter_mail() but it is getting affected. My code is:

$ message[‘from’] = ‘sender name’; $ message[‘headers’][‘From’] = $ message[‘from’];

Email ‘From’ is getting set But not the ‘FromName’.

Magento 2.2.4- Order Confirmation Email not being sent Automtically

So I am facing an issue, that the order confirmation mails are not being sent by magento2 for COD/checkmo orders

Whenever you open an order it shows (The order confirmation email is not sent)

But when you click the Send Email button, the mail gets sent immediately.

I have checked the following settings:

Stores > Configuration > Sales > Sales Emails

Asynchronus sending: DISABLE

Order, Order Comments, Credit Memo, etc: Enabled -> YES

Looked on the internet, every solution revolved around these settings only, no solution. please help!