You're doing a lot of things right. My advice to you is a multi-pronged strategy. Some of this will sound redundant with other answers. I mention them anyway, because they are all part of the strategy. (If I only presented the new info, my answer would not be very self-contained.) Plus, I agree with the points I'm re-iterating, so strongly that I think redundant mentioning is a good thing. I happily join the choir of voices that say some of the same things.
Require Searching
The first prong is: make sure people use the internal resources.
As a policy that you enforce (more information on enforcement is in the "Team Effort" "section of this answer"/"prong of this strategy"), when people ask you questions, they must provide:
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A clear description of what they are after
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This could be information they want, or something else, such as permission for something
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What were the results of trying to find the information, and in what way were those results unclear/insufficient?
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The search is expected to include internal documentation
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The search is expected to include ticket history
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The search is expected to include public web
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Recommendations (or at least, what do I think makes sense to do next) should be provided
They are, very simply, not allowed to just ask, "Help me." If they do, they are required to "Follow the process". That means, they provide the above information.
If they don't provide that information, then you take the time to invest in your co-worker, by not providing them with the answer, but providing them with the requirements. "I don't see any reference showing the results of your search for this answer. Please explain what was searched, and what was found. (Then I will happily fill in the missing pieces.)" *
- As a bonus, since the question was asked, you're welcome to cheat. Start writing up the answer for the next E-Mail when they tell you what's happening, and maybe modify the documentation if it is insufficient.
Have Documentation
It sounds like you are happy to refer people to old E-Mails. Stop that.
E-Mails are not usually a key documentation source:
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One problem is that they often have lots of information that are specific to a situation. If someone else needs to access that E-Mail, they have to filter out all of the details that aren't relevant
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When you quit, your E-Mails will likely be purged. The alternative is that someone copies your E-Mails into a decent documentation format. In my experience, that is quite uncommon.
(Usually they decide just to invest effort in re-creating it, which has the benefit of being more up to date, but the cost of re-creating this. One reason is because having someone else go through your E-Mails to separate gems from coal is time consuming, and that cost often sways things in the direction of creating from scratch. Another possible reason for this is the feeling that going through all your E-Mails may be a bit disrespectful, making that unattractive.)
The solution to this is: you be that person. You're among the most familiar person with the E-Mails in your mailbox, especially if you were the author. You be the person who puts the info in your centralized documentation.
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New people don't have access to the old E-Mails. Re-sending them a copy of the E-Mail is time-consuming for the experts. It is better that the information be in a centralized database that they can use.
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Many people like to delete old E-Mails. This reduces burden on E-Mail storage systems. It is better to have documentation be served by technical systems that are designed for the purposes of long term storage and easy retrievability of information that has been sitting for a while.
Basically, if you need to refer to an old E-Mail, it means that you didn't correctly foresee the need for someone to ask this again. Which means you didn't succeed at getting the information into one of the public documentation resources. This is an understandable oversight; we're all less than perfect at predicting everything every time. Just do the right thing to take care of the results of this problem: Get the information out of just being in your E-Mail, and place it on an internal documentation resource. Stop relying so much on old E-Mails.
You mentioned a documentation resource. (You called it a wiki.) Great.
Another source of documentation, which I've found can be very useful, is ticket history. When work is assigned, people are required to document what they've done.
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It removes you from the burden of "Remember when...", because they should have bumped into that themselves.
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Another benefit from this is that you end up having multiple people contributing to the documentation.
Team Effort
I have seen this work very well in an environment where there were multiple people with greater expertise in the company. Those with expertise all got behind the efforts of making sure people with less expertise are following the process.
I have seen this work multiple times. (In other words, we had new staff members come on multiple occasions.) Each time, the process was the same:
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New staff didn't know about our internal resources, or even our internal processes
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We enforced the internal process of requiring search, especially until it was clear that they were as comfortable as any of the rest of us at using internal resources
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This process may take around 1-3 weeks before they instinctively trust that they absolutely must follow the process, or else it just takes them longer anyway (and makes them look less good). Then, they heavily reduce how often they do that.
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Still, they linger on doing that until 21/2-4 months after hire date. By that point, they start being more trusted to have done simple searching before unnecessarily sapping other technical resources. Until then, experienced staff remain cautious about what information is just easily provided.
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(These time frames are just some of my estimates based on some memory.)
I totally remember a conversation:
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New guy knowingly violates policy, and asks question
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Experienced guy: "What were your search results?"
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New guy, speaking honestly: "I didn't do the search. Because, you're right there, and the most convenient thing for me to do is to just ask you real quick."
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Experienced guy: "I totally understand that. But the thing is, I'm just doing the most convenient thing for me to do. And that is to just quickly say, "What are the search results?" (And send you back, on your way to go do a task without requiring me.)
Both were laughing as the new guy was just totally caught red-handed at violating the policy, which means he is doomed to being given less benefit of the doubt, which means the experienced staff who witnessed this will be less inclined to give quick answers and be more inclined to make sure the process is completely (albeit painfully) beaten into the new staff.
The strategy I mention should have management buy-in. Make sure that the process is actually required; that it is a requirement dictated by management. (That is much easier if you are a manager.) If you don't have management buy-in, your success will be more limited. (Some may say you're doomed to fail. I say you might have limited success at simply managing how people interact with you. But, really, you want a more wide-scale success/effort, and that might impose some requirements on your environment, possibly changing culture a bit from what currently occurs. That will happen much better, if at all, with management's buy-in.)
Your position
We all agree that you're valuable. (Well, maybe we're just giving you the benefit of the doubt, trusting what you say. But, I think most of the people here are comfortable operating under that assumption.)
Fattie's comment mentioned you need a raise. Seth Greylyn's answer called you a "mission-critical" silo. teego1967's answer says you need to train.
The problem with Fattie's suggestion is simply this: if the company were to give a raise (which companies typically don't particularly like to do), then that doesn't resolve the problem: You're still in the same situation, and you're not going to just keep getting raises infinitely.
What you're going to want to do is to make sure you're a leader. That may mean getting a new position/title. That may mean getting promoted.
Some of the rest of this might not apply if you officially are already a manager. (I'm writing these suggestions under the assumption that you might not yet be.)
Whether you've previously realized it or not, you're getting to be management-type material. You are a leader, to at least some extent. Formalize that, so that you don't have power/obstacles getting in your way. Then, instead of your actions looking like you are "trying to exert power over his peers", which is often seen as a more negative thing, you can be "applying oversight to those under him", which may be seen as a more positive thing.
To do that, make sure that some of your official duties involve oversight/training/etc. You might also want to include documenting as a key role. Since you're going to be doing these helpful things anyway, it makes sense to be (officially) recognized as someone from whom it is proper to be doing these managerial-like things.
Even if you haven't thought of yourself as a manager to date, you're at least on the verge of being in that role. So, if you're not ready to make a daring move (by proposing a change in your official position), at least start making the move mentally, preparing yourself for the adjustment that happens as you become one of the experienced folks that other people rely on. When you've decided what you want, which will work well for you in the long term, then seek to formalize that. (Also, while you're at it, see if the "promotion" can come with the raise that Fattie was suggesting.)
Summary
My two recommendations for you are:
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Deploy a multi-pronged strategy:
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Require searching
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Require a description of what they want, results of searching, and recommendation of next step
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Require documentation be used
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Make this a team effort
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Seek promotion (if that's still needed)