Hi Jewels

If Mail is definitely searching the correct Mailbox (as you can set it to 
search just one folder, just the Inbox, or “all folders”) then it could be an 
issue with the Spotlight search for it.
You can set it to “stop” searching in Spotlight, then after a few minutes 
“Removing” it again to make it start searching.
Another option is to remove the Envelope files which forces it to reindex email 
once it opens again.

With these things, you need to ensure you have a good backup before you start 
(just incase something goes wrong, you can then go back to the “original” files.

To do the rebuild of Spotlight and the “stop/go” solution, have a look at this 
link here - 
https://support.4it.com.au/article/search-not-working-or-incomplete-results-in-osx-el-capitan-mac-mail/
(Section 2 covers it. And Section 3 covers the removal of envelope files).

If still no success, then you can force Spotlight to “Reset” itself a few 
different ways, so this can sometimes help as well.
Again, ensure you have a good backup before you start. And you have to be 
“slightly comfortable “ in using Terminal for parts of this.
https://www.boxaid.com/blog/search-not-working-mac-el-capitan/

But either of those should hopefully get it working for you. (Start with the 
easy ones first, then work your way through to the later ones).

Hope that information helps.
Kind regards
Daniel

---
Daniel Kerr
MacWizardry

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Email: <daniel AT macwizardry.com.au>
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> On 26 Aug 2019, at 8:49 pm, Julie Bedford <jew...@iinet.net.au> wrote:
> 
> Hi Ronni
> 
> Sadly no change.
> 
> Jewels
> 
>> On 26 Aug 2019, at 4:09 PM, Julie Bedford <jew...@iinet.net.au> wrote:
>> 
>> Hi Ronni
>> 
>> Thanks for your prompt reply !
>> 
>> 1.  Checked Mailbox (in the top menu), then to ‘Go to Favourite Mail Box; - 
>> already selected as ‘in box’
>> 
>> 2. Mail already includes bin, junk etc
>> 
>> 3. I have synchronised, as suggested
>> 
>> 4. Spotlight suggestions was ticked already.
>> 
>> When I put a name in the search box in mail, it appears to only search ‘mail 
>> boxes’ and not the in box.  When I click the magnifying glass in the mail 
>> search bar, it comes up with ‘mailboxes’ as the only option.  Mail has 
>> worked perfectly for years but not now.
>> 
>> I’ll do a shut down and see if mail updates.  I’ll get back to you either 
>> way.
>> 
>> Many thanks
>> 
>> Jewels
>> 
>>> On 26 Aug 2019, at 3:12 PM, Ronni Brown <ro...@mac.com> wrote:
>>> 
>>> Hi Jewels, 
>>> 
>>>     • If a specific mailbox is selected in the Favourites bar, Mail 
>>> searches only that mailbox. To search all mailboxes instead, click All.
>>>     • Mail may not be looking in the Bin or Junk mailboxes, or searching 
>>> encrypted messages. To include them when searching all mailboxes, choose 
>>> Mail > Preferences, click General, then select the options.
>>>     • You may need to sync the mailboxes on your Mac with those on the mail 
>>> server. Choose Mailbox > Synchronise > [account].
>>>     • The Mail folder (located in your home Library folder) may be excluded 
>>> from Spotlight searching. To check, choose Apple menu  > System 
>>> Preferences, click Spotlight, then click Privacy.
>>> Kind Regards,
>>>       Ronni
>>> 
>>>  Ronni Brown’s iPad Pro 12.9-inch 256GB 
>>> 
>>> 
>>> On 26 Aug 2019, at 3:06 pm, Stephen Chape <chap...@bigpond.com> wrote:
>>> 
>>>> Hi Jewels.
>>>> 
>>>> In Mail got to Preferences/Accounts/Mailbox Behaviours
>>>> That should at least resolve the “Mail Deleting” issue.
>>>> 
>>>>> On 26 Aug 2019, at 2:59 pm, Julie Bedford <jew...@iinet.net.au> wrote:
>>>>> 
>>>>> 
>>>>> Hi All,
>>>>> 
>>>>> I’m having a very frustrating time with my MacPro running El Capitan 
>>>>> 10.11.16.  About 2 months ago, I found I was unable to search for emails 
>>>>> sent and received in the search bar.  I work from home and daily need to 
>>>>> locate older received / sent emails.  As you can imagine, it literally 
>>>>> takes me hours to locate a particular email.
>>>>> 
>>>>> I also have an imac running Mojave - the mail used to operate just fine 
>>>>> until recently and now it deletes all incoming and outgoing emails approx 
>>>>> a month old. 
>>>>> 
>>>>> Would be grateful if anyone can give me direction.
>>>>> 
>>>>> Jewels
>>>>> 
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>>>> 
>>>> 
>>>> Regards,
>>>> Stephen Chape
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
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