diff --git a/webadmin/admin.js b/webadmin/admin.js
index 0bb9090..ea9730a 100644
--- a/webadmin/admin.js
+++ b/webadmin/admin.js
@@ -2214,7 +2214,6 @@ const account = async (name) => {
 	let password;
 	let passwordHint;
 	const xparseSize = (s) => {
-		const origs = s;
 		s = s.toLowerCase();
 		let mult = 1;
 		if (s.endsWith('k')) {
@@ -2233,8 +2232,8 @@ const account = async (name) => {
 			s = s.substring(0, s.length - 1);
 		}
 		let v = parseInt(s);
-		if (isNaN(v) || origs !== formatQuotaSize(v * mult)) {
-			throw new Error('invalid number');
+		if (isNaN(v) || s !== '' + v) {
+			throw new Error('invalid number; use units like "k", "m", "g", for example "2g". specify 0 to use the global default quota, or -1 for unlimited storage overriding the global quota');
 		}
 		return v * mult;
 	};
@@ -2272,10 +2271,10 @@ const account = async (name) => {
 	}, fieldset = dom.fieldset(dom.label(style({ display: 'inline-block' }), dom.span('Localpart', attr.title('The localpart is the part before the "@"-sign of an email address. If empty, a catchall address is configured for the domain.')), dom.br(), localpart = dom.input()), '@', dom.label(style({ display: 'inline-block' }), dom.span('Domain'), dom.br(), domain = dom.select((domains || []).map(d => dom.option(domainName(d), domainName(d) === config.Domain ? attr.selected('') : [])))), ' ', dom.submitbutton('Add address'))), dom.br(), dom.h2('Aliases/lists'), dom.table(dom.thead(dom.tr(dom.th('Alias address'), dom.th('Subscription address'), dom.th('Allowed senders', attr.title('Whether only members can send through the alias/list, or anyone.')), dom.th('Send as alias address', attr.title('If enabled, messages can be sent with the alias address in the message "From" header.')), dom.th('Members visible', attr.title('If enabled, members can see the addresses of other members.')))), (config.Aliases || []).length === 0 ? dom.tr(dom.td(attr.colspan('6'), 'None')) : [], (config.Aliases || []).sort((a, b) => a.Alias.LocalpartStr < b.Alias.LocalpartStr ? -1 : (domainName(a.Alias.Domain) < domainName(b.Alias.Domain) ? -1 : 1)).map(a => dom.tr(dom.td(dom.a(prewrap(a.Alias.LocalpartStr, '@', domainName(a.Alias.Domain)), attr.href('#domains/' + domainName(a.Alias.Domain) + '/alias/' + encodeURIComponent(a.Alias.LocalpartStr)))), dom.td(prewrap(a.SubscriptionAddress)), dom.td(a.Alias.PostPublic ? 'Anyone' : 'Members only'), dom.td(a.Alias.AllowMsgFrom ? 'Yes' : 'No'), dom.td(a.Alias.ListMembers ? 'Yes' : 'No'), dom.td(dom.clickbutton('Remove', async function click(e) {
 		await check(e.target, client.AliasAddressesRemove(a.Alias.LocalpartStr, domainName(a.Alias.Domain), [a.SubscriptionAddress]));
 		window.location.reload(); // todo: reload less
-	}))))), dom.br(), dom.h2('Settings'), dom.form(fieldsetSettings = dom.fieldset(dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Maximum outgoing messages per day', attr.title('Maximum number of outgoing messages for this account in a 24 hour window. This limits the damage to recipients and the reputation of this mail server in case of account compromise. Default 1000. MaxOutgoingMessagesPerDay in configuration file.')), dom.br(), maxOutgoingMessagesPerDay = dom.input(attr.type('number'), attr.required(''), attr.value('' + (config.MaxOutgoingMessagesPerDay || 1000)))), dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Maximum first-time recipients per day', attr.title('Maximum number of first-time recipients in outgoing messages for this account in a 24 hour window. This limits the damage to recipients and the reputation of this mail server in case of account compromise. Default 200. MaxFirstTimeRecipientsPerDay in configuration file.')), dom.br(), maxFirstTimeRecipientsPerDay = dom.input(attr.type('number'), attr.required(''), attr.value('' + (config.MaxFirstTimeRecipientsPerDay || 200)))), dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Disk usage quota: Maximum total message size ', attr.title('Default maximum total message size in bytes for the account, overriding any globally configured default maximum size if non-zero. A negative value can be used to have no limit in case there is a limit by default. Attempting to add new messages to an account beyond its maximum total size will result in an error. Useful to prevent a single account from filling storage.')), dom.br(), quotaMessageSize = dom.input(attr.value(formatQuotaSize(config.QuotaMessageSize))), ' Current usage is ', formatQuotaSize(Math.floor(diskUsage / (1024 * 1024)) * 1024 * 1024), '.'), dom.div(style({ display: 'block', marginBottom: '.5ex' }), dom.label(firstTimeSenderDelay = dom.input(attr.type('checkbox'), config.NoFirstTimeSenderDelay ? [] : attr.checked('')), ' ', dom.span('Delay deliveries from first-time senders.', attr.title('To slow down potential spammers, when the message is misclassified as non-junk. Turning off the delay can be useful when the account processes messages automatically and needs fast responses.')))), dom.submitbutton('Save')), async function submit(e) {
+	}))))), dom.br(), dom.h2('Settings'), dom.form(fieldsetSettings = dom.fieldset(dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Maximum outgoing messages per day', attr.title('Maximum number of outgoing messages for this account in a 24 hour window. This limits the damage to recipients and the reputation of this mail server in case of account compromise. Default 1000. MaxOutgoingMessagesPerDay in configuration file.')), dom.br(), maxOutgoingMessagesPerDay = dom.input(attr.type('number'), attr.required(''), attr.value('' + (config.MaxOutgoingMessagesPerDay || 1000)))), dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Maximum first-time recipients per day', attr.title('Maximum number of first-time recipients in outgoing messages for this account in a 24 hour window. This limits the damage to recipients and the reputation of this mail server in case of account compromise. Default 200. MaxFirstTimeRecipientsPerDay in configuration file.')), dom.br(), maxFirstTimeRecipientsPerDay = dom.input(attr.type('number'), attr.required(''), attr.value('' + (config.MaxFirstTimeRecipientsPerDay || 200)))), dom.label(style({ display: 'block', marginBottom: '.5ex' }), dom.span('Disk usage quota: Maximum total message size ', attr.title('Default maximum total message size in bytes for the account, overriding any globally configured default maximum size if non-zero. A negative value can be used to have no limit in case there is a limit by default. Attempting to add new messages to an account beyond its maximum total size will result in an error. Useful to prevent a single account from filling storage. Use units "k" for kilobytes, or "m", "g", "t".')), dom.br(), quotaMessageSize = dom.input(attr.value(formatQuotaSize(config.QuotaMessageSize))), ' Current usage is ', formatQuotaSize(Math.floor(diskUsage / (1024 * 1024)) * 1024 * 1024), '.'), dom.div(style({ display: 'block', marginBottom: '.5ex' }), dom.label(firstTimeSenderDelay = dom.input(attr.type('checkbox'), config.NoFirstTimeSenderDelay ? [] : attr.checked('')), ' ', dom.span('Delay deliveries from first-time senders.', attr.title('To slow down potential spammers, when the message is misclassified as non-junk. Turning off the delay can be useful when the account processes messages automatically and needs fast responses.')))), dom.submitbutton('Save')), async function submit(e) {
 		e.stopPropagation();
 		e.preventDefault();
-		await check(fieldsetSettings, client.AccountSettingsSave(name, parseInt(maxOutgoingMessagesPerDay.value) || 0, parseInt(maxFirstTimeRecipientsPerDay.value) || 0, xparseSize(quotaMessageSize.value), firstTimeSenderDelay.checked));
+		await check(fieldsetSettings, (async () => client.AccountSettingsSave(name, parseInt(maxOutgoingMessagesPerDay.value) || 0, parseInt(maxFirstTimeRecipientsPerDay.value) || 0, xparseSize(quotaMessageSize.value), firstTimeSenderDelay.checked))());
 	}), dom.br(), dom.h2('Set new password'), formPassword = dom.form(fieldsetPassword = dom.fieldset(dom.label(style({ display: 'inline-block' }), 'New password', dom.br(), password = dom.input(attr.type('password'), attr.autocomplete('new-password'), attr.required(''), function focus() {
 		passwordHint.style.display = '';
 	})), ' ', dom.submitbutton('Change password')), passwordHint = dom.div(style({ display: 'none', marginTop: '.5ex' }), dom.clickbutton('Generate random password', function click(e) {
diff --git a/webadmin/admin.ts b/webadmin/admin.ts
index e682c36..ecc5139 100644
--- a/webadmin/admin.ts
+++ b/webadmin/admin.ts
@@ -782,7 +782,6 @@ const account = async (name: string) => {
 	let passwordHint: HTMLElement
 
 	const xparseSize = (s: string) => {
-		const origs = s
 		s = s.toLowerCase()
 		let mult = 1
 		if (s.endsWith('k')) {
@@ -798,8 +797,8 @@ const account = async (name: string) => {
 			s = s.substring(0, s.length-1)
 		}
 		let v = parseInt(s)
-		if (isNaN(v) || origs !== formatQuotaSize(v*mult)) {
-			throw new Error('invalid number')
+		if (isNaN(v) || s !== ''+v) {
+			throw new Error('invalid number; use units like "k", "m", "g", for example "2g". specify 0 to use the global default quota, or -1 for unlimited storage overriding the global quota')
 		}
 		return v*mult
 	}
@@ -929,7 +928,7 @@ const account = async (name: string) => {
 				),
 				dom.label(
 					style({display: 'block', marginBottom: '.5ex'}),
-					dom.span('Disk usage quota: Maximum total message size ', attr.title('Default maximum total message size in bytes for the account, overriding any globally configured default maximum size if non-zero. A negative value can be used to have no limit in case there is a limit by default. Attempting to add new messages to an account beyond its maximum total size will result in an error. Useful to prevent a single account from filling storage.')),
+					dom.span('Disk usage quota: Maximum total message size ', attr.title('Default maximum total message size in bytes for the account, overriding any globally configured default maximum size if non-zero. A negative value can be used to have no limit in case there is a limit by default. Attempting to add new messages to an account beyond its maximum total size will result in an error. Useful to prevent a single account from filling storage. Use units "k" for kilobytes, or "m", "g", "t".')),
 					dom.br(),
 					quotaMessageSize=dom.input(attr.value(formatQuotaSize(config.QuotaMessageSize))),
 					' Current usage is ', formatQuotaSize(Math.floor(diskUsage/(1024*1024))*1024*1024), '.',
@@ -946,7 +945,7 @@ const account = async (name: string) => {
 			async function submit(e: SubmitEvent) {
 				e.stopPropagation()
 				e.preventDefault()
-				await check(fieldsetSettings, client.AccountSettingsSave(name, parseInt(maxOutgoingMessagesPerDay.value) || 0, parseInt(maxFirstTimeRecipientsPerDay.value) || 0, xparseSize(quotaMessageSize.value), firstTimeSenderDelay.checked))
+				await check(fieldsetSettings, (async () => client.AccountSettingsSave(name, parseInt(maxOutgoingMessagesPerDay.value) || 0, parseInt(maxFirstTimeRecipientsPerDay.value) || 0, xparseSize(quotaMessageSize.value), firstTimeSenderDelay.checked))())
 			},
 		),
 		dom.br(),