# BT-58 Buyer contact email address

Email address for the buyer contact point.

## Quick answer

> **Buyer details**: Who receives the invoice and which buyer records or routing data must match.

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-58)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-58)

## In plain language

Email address for the buyer contact point.

Email address for the buyer contact point.

This helps invoice follow-up reach the right mailbox when the buyer processes invoices centrally.

## What you usually enter here

Email address

Typical valid values include: ap@buyer.example

Optional according to EN 16931-1.

## What goes wrong often

Avoid values like: not-an-email

## Examples in context

This helps invoice follow-up reach the right mailbox when the buyer processes invoices centrally.

Optional according to EN 16931-1.

## Valid Examples

- ap@buyer.example

## Invalid Examples

- not-an-email

## Related Fields

This helps invoice follow-up reach the right mailbox when the buyer processes invoices centrally.

- [BT-56 Buyer contact point](/resources/xrechnung/bt-56-buyer-contact-point)
- [BT-57 Buyer contact telephone number](/resources/xrechnung/bt-57-buyer-contact-telephone-number)

## XML mapping and field facts

Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.

### Field ID:
BT-58

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
100 characters

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:Contact/cbc:ElectronicMail
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:DefinedTradeContact/ram:EmailURIUniversalCommunication/ram:URIID
```

## Create an XRechnung from your PDF

The converter reads the invoice and shows the fields it found before download, so you can check and correct the values. No PDF? Fill in the XRechnung directly in the form.

- [Convert invoice](/en/pdf-to-xrechnung)
- [Fill in XRechnung in the form](/en/create-xrechnung)

Download requires an account. Subscriptions from €10/month with annual billing (excl. taxes), or €5 per conversion (excl. taxes) without a subscription.

## Why the standard cares about this field

### Business Context
This helps invoice follow-up reach the right mailbox when the buyer processes invoices centrally.

### Legal Requirement
Optional according to EN 16931-1.

## Official sources and tools

- [KoSIT Validator](https://erechnungsvalidator.service-bw.de/)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)