To manage that issue with logins in GyazMail, you need to open Keychain Access.app:
- Find the keychain associated with your Yahoo Mail login. Get Info (Cmd-I) on that keychain.
- On the info window, switch from the “Attributes” tab to the “Access Control” tab.
- If it isn’t already, select the “Allow all applications to access this item” radio button (see below). This should mend the GyazMail password request issue you ran into.
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I’m a user of GyazMail and I have been since 2004 (using it to replace Eudora). The aforementioned issue emerged for me in 2019 — which was when I reverse-migrated my email back to a PowerPC Mac (having had my GyazMail configuration and archives on Intel Macs between 2008 and 2019). This means that whatever the issue which causes the above problem is something which emerged sometime during that window when I was not using a PowerPC Mac running Leopard. I found the remedy after tracking down a thread online regarding a different PowerPC application on Leopard presenting similar issues with passwords.
I don’t plan to stop using GyazMail, especially as Gouichi, the developer, has continued to port it to run on current, 64-bit Apple hardware and seems intent on maintaining it for as long as feasible. As a client, its UI/UX is exactly what I always expect from email, and it has served my needs very well — especially with being able to configure receiving and sending email as plaintext, without HTML (which also means I often “miss” aggressively formatted email from advertisers).
In recent years, GyazMail has fallen a bit behind the current, highly demanding and proprietary authentication protocols (like 2FA, OAuth, and so on) by some major “free” email services (Gmail, Outlook 365, and others), but what this has made me do is pare down the number of extant email accounts I’ve had (I had several on Gmail, each for different, discrete use-cases, including my original one from ’04) and to find email service solutions which still permit standard POP3/IMAP retrieval via STARTTLS or similar. This doesn’t solve all my email issues (such as uni alumni email or work email), but for now, I still have GyazMail for continued access for other accounts.
Anyway, I hope the above steps help out!