btcpayserver/BTCPayServer/Views/Shared/EmailsBody.cshtml

@model BTCPayServer.Models.ServerViewModels.EmailsViewModel

<div class="row">
    <div class="col-lg-6">
        <div class="d-flex align-items-center justify-content-between mb-4">
            <h2 class="mb-0">@ViewData["Title"]</h2>
            <div class="dropdown only-for-js" id="quick-fill">
                <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false" id="QuickFillDropdownToggle">
                    Quick fill settings for...
                </button>
                <div class="dropdown-menu" aria-labelledby="QuickFillDropdownToggle">
                    <a class="dropdown-item" href="" data-server="smtp.gmail.com" data-port="587" data-enablessl="true">Gmail.com</a>
                    <a class="dropdown-item" href="" data-server="mail.yahoo.com" data-port="587" data-enablessl="true">Yahoo.com</a>
                    <a class="dropdown-item" href="" data-server="smtp.mailgun.org" data-port="587" data-enablessl="true">Mailgun</a>
                    <a class="dropdown-item" href="" data-server="smtp.office365.com" data-port="587" data-enablessl="true">Office365</a>
                    <a class="dropdown-item" href="" data-server="smtp.sendgrid.net" data-port="587" data-enablessl="true">SendGrid</a>
                </div>
            </div>
        </div>
    </div>
</div>

<form method="post" autocomplete="off">
    <div class="row">
        <div class="col-lg-6">
            @if (!ViewContext.ModelState.IsValid)
            {
                <div asp-validation-summary="All" class="text-danger"></div>
            }
            <div class="form-group">
                <label asp-for="Settings.Server" class="form-label"></label>
                <input asp-for="Settings.Server" data-fill="server" class="form-control"/>
                <span asp-validation-for="Settings.Server" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Settings.Port" class="form-label"></label>
                <input asp-for="Settings.Port" data-fill="port" class="form-control"/>
                <span asp-validation-for="Settings.Port" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Settings.FromDisplay" class="form-label"></label>
                <input asp-for="Settings.FromDisplay" class="form-control"/>
                <small class="form-text text-muted">
                    Some email providers (like Gmail) don't allow you to set your display name, so this setting may not have any effect.
                </small>
                <span asp-validation-for="Settings.FromDisplay" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Settings.From" class="form-label"></label>
                <input asp-for="Settings.From" class="form-control"/>
                <span asp-validation-for="Settings.From" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Settings.Login" class="form-label"></label>
                <input asp-for="Settings.Login" class="form-control"/>
                <small class="form-text text-muted">
                    For many email providers (like Gmail) your login is your email address.
                </small>
                <span asp-validation-for="Settings.Login" class="text-danger"></span>
            </div>
            <div class="form-group">
                @if (!Model.PasswordSet)
                {

                    <label asp-for="Settings.Password" class="form-label"></label>
                    <input asp-for="Settings.Password" type="password" class="form-control"/>
                    <span asp-validation-for="Settings.Password" class="text-danger"></span>
                }
                else
                {
                    <label asp-for="Settings.Password" class="form-label"></label>
                    <div class="input-group">
                        <input value="Configured" type="text" readonly class="form-control"/>
                        <button type="submit" class="btn btn-danger" name="command" value="ResetPassword">Reset</button>
                    </div>
                }
            </div>
            <div class="form-group">
                <div class="form-check">
                    <input asp-for="Settings.EnableSSL" type="checkbox" data-fill="enablessl"  class="form-check-input"/>
                    <label asp-for="Settings.EnableSSL" class="form-check-label"></label>
                </div>
            </div>
            <input asp-for="PasswordSet" type="hidden"/>
            <button type="submit" class="btn btn-primary" name="command" value="Save">Save</button>
        </div>
    </div>

    <hr class="mt-5 mb-4" />

    <div class="row">
        <div class="col-md-6">
            <div class="form-group">
                <p class="form-text text-muted">
                    If you want to test your settings, enter an email address here and click "Send Test Email".
                    <strong>Your settings won't be saved</strong>, only a test email will be sent.
                    <br />
                    After a successful test, you can click "Save".
                </p>
                <label asp-for="TestEmail" class="form-label"></label>
                <input asp-for="TestEmail" class="form-control" />
                <span asp-validation-for="TestEmail" class="text-danger"></span>
            </div>
            <button type="submit" class="btn btn-secondary" name="command" value="Test">Send Test Email</button>
        </div>
    </div>
</form>

<script>
    document.addEventListener("DOMContentLoaded", function () {
        delegate('click', '#quick-fill .dropdown-menu a', function (e) {
            e.preventDefault();
            
            const data = e.target.dataset;
            Object.keys(data).forEach(function (key) {
                const value = data[key];
                const input = document.querySelector('input[data-fill="' + key + '"]');
                if (input) {
                    const type = input.getAttribute('type');
                    if (type === 'checkbox') {
                        input.checked = value;
                    } else {
                        input.value = value;
                    }
                }
            });
        });
    });
</script>